diff --git a/proto/rustproto.proto b/proto/rustproto.proto
index 89f037775..b9ca843c5 100644
--- a/proto/rustproto.proto
+++ b/proto/rustproto.proto
@@ -19,6 +19,8 @@ extend google.protobuf.FileOptions {
     optional bool tokio_bytes_all = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string_all = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive_all = 17013;
 
     // When true, will only generate codes that works with lite runtime.
     optional bool lite_runtime_all = 17035;
@@ -33,6 +35,8 @@ extend google.protobuf.MessageOptions {
     optional bool tokio_bytes = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive = 17013;
 }
 
 extend google.protobuf.FieldOptions {
@@ -44,4 +48,6 @@ extend google.protobuf.FieldOptions {
     optional bool tokio_bytes_field = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string_field = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive_field = 17013;
 }
diff --git a/protobuf-codegen/src/customize/mod.rs b/protobuf-codegen/src/customize/mod.rs
index 826bd3f6d..bebb7658b 100644
--- a/protobuf-codegen/src/customize/mod.rs
+++ b/protobuf-codegen/src/customize/mod.rs
@@ -98,6 +98,8 @@ pub struct Customize {
     pub(crate) tokio_bytes: Option<bool>,
     /// Use `bytes::Bytes` for `string` fields
     pub(crate) tokio_bytes_for_string: Option<bool>,
+    /// When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    pub(crate) oneofs_non_exhaustive: Option<bool>,
     /// Enable lite runtime.
     pub(crate) lite_runtime: Option<bool>,
     /// Generate `mod.rs` in the output directory.
@@ -148,6 +150,11 @@ impl Customize {
         self
     }
 
+    pub fn oneofs_non_exhaustive(mut self, non_exhaustive: bool) -> Self {
+        self.oneofs_non_exhaustive = Some(non_exhaustive);
+        self
+    }
+
     /// Generate code for "lite runtime". Generated code contains no code for reflection.
     /// So the generated code (and more importantly, generated binary size) is smaller,
     /// but reflection, text format, JSON serialization won't work.
diff --git a/protobuf-codegen/src/customize/rustproto_proto.rs b/protobuf-codegen/src/customize/rustproto_proto.rs
index 3d9a77b2f..e48303102 100644
--- a/protobuf-codegen/src/customize/rustproto_proto.rs
+++ b/protobuf-codegen/src/customize/rustproto_proto.rs
@@ -12,6 +12,7 @@ pub(crate) fn customize_from_rustproto_for_message(source: &MessageOptions) -> C
     let generate_getter = rustproto::exts::generate_getter.get(source);
     let tokio_bytes = rustproto::exts::tokio_bytes.get(source);
     let tokio_bytes_for_string = rustproto::exts::tokio_bytes_for_string.get(source);
+    let oneofs_non_exhaustive = rustproto::exts::oneofs_non_exhaustive.get(source);
     let lite_runtime = None;
     let gen_mod_rs = None;
     let inside_protobuf = None;
@@ -21,6 +22,7 @@ pub(crate) fn customize_from_rustproto_for_message(source: &MessageOptions) -> C
         generate_getter,
         tokio_bytes,
         tokio_bytes_for_string,
+        oneofs_non_exhaustive,
         lite_runtime,
         gen_mod_rs,
         inside_protobuf,
@@ -37,6 +39,7 @@ pub(crate) fn customize_from_rustproto_for_field(source: &FieldOptions) -> Custo
     let generate_getter = rustproto::exts::generate_getter_field.get(source);
     let tokio_bytes = rustproto::exts::tokio_bytes_field.get(source);
     let tokio_bytes_for_string = rustproto::exts::tokio_bytes_for_string_field.get(source);
+    let oneofs_non_exhaustive = rustproto::exts::oneofs_non_exhaustive_field.get(source);
     let lite_runtime = None;
     let gen_mod_rs = None;
     let inside_protobuf = None;
@@ -46,6 +49,7 @@ pub(crate) fn customize_from_rustproto_for_field(source: &FieldOptions) -> Custo
         generate_getter,
         tokio_bytes,
         tokio_bytes_for_string,
+        oneofs_non_exhaustive,
         lite_runtime,
         gen_mod_rs,
         inside_protobuf,
@@ -58,6 +62,7 @@ pub(crate) fn customize_from_rustproto_for_file(source: &FileOptions) -> Customi
     let generate_getter = rustproto::exts::generate_getter_all.get(source);
     let tokio_bytes = rustproto::exts::tokio_bytes_all.get(source);
     let tokio_bytes_for_string = rustproto::exts::tokio_bytes_for_string_all.get(source);
+    let oneofs_non_exhaustive = rustproto::exts::oneofs_non_exhaustive_all.get(source);
     let lite_runtime = rustproto::exts::lite_runtime_all.get(source);
     let gen_mod_rs = None;
     let inside_protobuf = None;
@@ -67,6 +72,7 @@ pub(crate) fn customize_from_rustproto_for_file(source: &FileOptions) -> Customi
         generate_getter,
         tokio_bytes,
         tokio_bytes_for_string,
+        oneofs_non_exhaustive,
         lite_runtime,
         inside_protobuf,
         gen_mod_rs,
diff --git a/protobuf-codegen/src/gen/oneof.rs b/protobuf-codegen/src/gen/oneof.rs
index 3f34cdccf..e1bd33901 100644
--- a/protobuf-codegen/src/gen/oneof.rs
+++ b/protobuf-codegen/src/gen/oneof.rs
@@ -252,7 +252,14 @@ impl<'a> OneofGen<'a> {
     fn write_enum(&self, w: &mut CodeWriter) {
         let derive = vec!["Clone", "PartialEq", "Debug"];
         w.derive(&derive);
-        w.write_line("#[non_exhaustive]");
+        if self
+            .customize
+            .for_elem
+            .oneofs_non_exhaustive
+            .unwrap_or(true)
+        {
+            w.write_line("#[non_exhaustive]");
+        }
         write_protoc_insertion_point_for_oneof(w, &self.customize.for_elem, &self.oneof.oneof);
         w.pub_enum(&self.oneof.rust_name().ident.to_string(), |w| {
             for variant in self.variants_except_group() {
diff --git a/protobuf-parse/src/proto/rustproto.proto b/protobuf-parse/src/proto/rustproto.proto
index 89f037775..b9ca843c5 100644
--- a/protobuf-parse/src/proto/rustproto.proto
+++ b/protobuf-parse/src/proto/rustproto.proto
@@ -19,6 +19,8 @@ extend google.protobuf.FileOptions {
     optional bool tokio_bytes_all = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string_all = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive_all = 17013;
 
     // When true, will only generate codes that works with lite runtime.
     optional bool lite_runtime_all = 17035;
@@ -33,6 +35,8 @@ extend google.protobuf.MessageOptions {
     optional bool tokio_bytes = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive = 17013;
 }
 
 extend google.protobuf.FieldOptions {
@@ -44,4 +48,6 @@ extend google.protobuf.FieldOptions {
     optional bool tokio_bytes_field = 17011;
     // Use `bytes::Bytes` for `string` fields
     optional bool tokio_bytes_for_string_field = 17012;
+    // When false, `#[non_exhaustive]` is not generated for `oneof` fields.
+    optional bool oneofs_non_exhaustive_field = 17013;
 }
diff --git a/protobuf/src/rustproto.rs b/protobuf/src/rustproto.rs
index c0f860e8a..6f161b6d5 100644
--- a/protobuf/src/rustproto.rs
+++ b/protobuf/src/rustproto.rs
@@ -32,6 +32,8 @@ pub mod exts {
 
     pub const tokio_bytes_for_string_all: crate::ext::ExtFieldOptional<crate::descriptor::FileOptions, bool> = crate::ext::ExtFieldOptional::new(17012, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 
+    pub const oneofs_non_exhaustive_all: crate::ext::ExtFieldOptional<crate::descriptor::FileOptions, bool> = crate::ext::ExtFieldOptional::new(17013, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
+
     pub const lite_runtime_all: crate::ext::ExtFieldOptional<crate::descriptor::FileOptions, bool> = crate::ext::ExtFieldOptional::new(17035, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 
     pub const generate_accessors: crate::ext::ExtFieldOptional<crate::descriptor::MessageOptions, bool> = crate::ext::ExtFieldOptional::new(17004, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
@@ -42,6 +44,8 @@ pub mod exts {
 
     pub const tokio_bytes_for_string: crate::ext::ExtFieldOptional<crate::descriptor::MessageOptions, bool> = crate::ext::ExtFieldOptional::new(17012, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 
+    pub const oneofs_non_exhaustive: crate::ext::ExtFieldOptional<crate::descriptor::MessageOptions, bool> = crate::ext::ExtFieldOptional::new(17013, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
+
     pub const generate_accessors_field: crate::ext::ExtFieldOptional<crate::descriptor::FieldOptions, bool> = crate::ext::ExtFieldOptional::new(17004, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 
     pub const generate_getter_field: crate::ext::ExtFieldOptional<crate::descriptor::FieldOptions, bool> = crate::ext::ExtFieldOptional::new(17005, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
@@ -49,6 +53,8 @@ pub mod exts {
     pub const tokio_bytes_field: crate::ext::ExtFieldOptional<crate::descriptor::FieldOptions, bool> = crate::ext::ExtFieldOptional::new(17011, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 
     pub const tokio_bytes_for_string_field: crate::ext::ExtFieldOptional<crate::descriptor::FieldOptions, bool> = crate::ext::ExtFieldOptional::new(17012, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
+
+    pub const oneofs_non_exhaustive_field: crate::ext::ExtFieldOptional<crate::descriptor::FieldOptions, bool> = crate::ext::ExtFieldOptional::new(17013, crate::descriptor::field_descriptor_proto::Type::TYPE_BOOL);
 }
 
 static file_descriptor_proto_data: &'static [u8] = b"\
@@ -59,85 +65,104 @@ static file_descriptor_proto_data: &'static [u8] = b"\
     R\x11generateGetterAll:F\n\x0ftokio_bytes_all\x18\xf3\x84\x01\x20\x01(\
     \x08\x12\x1c.google.protobuf.FileOptionsR\rtokioBytesAll:Z\n\x1atokio_by\
     tes_for_string_all\x18\xf4\x84\x01\x20\x01(\x08\x12\x1c.google.protobuf.\
-    FileOptionsR\x16tokioBytesForStringAll:H\n\x10lite_runtime_all\x18\x8b\
-    \x85\x01\x20\x01(\x08\x12\x1c.google.protobuf.FileOptionsR\x0eliteRuntim\
-    eAll:P\n\x12generate_accessors\x18\xec\x84\x01\x20\x01(\x08\x12\x1f.goog\
-    le.protobuf.MessageOptionsR\x11generateAccessors:J\n\x0fgenerate_getter\
-    \x18\xed\x84\x01\x20\x01(\x08\x12\x1f.google.protobuf.MessageOptionsR\
-    \x0egenerateGetter:B\n\x0btokio_bytes\x18\xf3\x84\x01\x20\x01(\x08\x12\
-    \x1f.google.protobuf.MessageOptionsR\ntokioBytes:V\n\x16tokio_bytes_for_\
-    string\x18\xf4\x84\x01\x20\x01(\x08\x12\x1f.google.protobuf.MessageOptio\
-    nsR\x13tokioBytesForString:Y\n\x18generate_accessors_field\x18\xec\x84\
-    \x01\x20\x01(\x08\x12\x1d.google.protobuf.FieldOptionsR\x16generateAcces\
-    sorsField:S\n\x15generate_getter_field\x18\xed\x84\x01\x20\x01(\x08\x12\
-    \x1d.google.protobuf.FieldOptionsR\x13generateGetterField:K\n\x11tokio_b\
-    ytes_field\x18\xf3\x84\x01\x20\x01(\x08\x12\x1d.google.protobuf.FieldOpt\
-    ionsR\x0ftokioBytesField:_\n\x1ctokio_bytes_for_string_field\x18\xf4\x84\
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-    ^\x20see\x20https://github.com/gogo/protobuf/blob/master/gogoproto/gogo.\
-    proto\n\x20for\x20the\x20original\x20idea\n2{\x20Generated\x20files\x20c\
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-    \n\n\n\x03\x07\x03\x01\x12\x03\x14\x12,\n\n\n\x03\x07\x03\x03\x12\x03\
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-    \x20only\x20generate\x20codes\x20that\x20works\x20with\x20lite\x20runtim\
-    e.\n\n\n\n\x03\x07\x04\x02\x12\x03\x0c\x07\"\n\n\n\x03\x07\x04\x04\x12\
-    \x03\x17\x04\x0c\n\n\n\x03\x07\x04\x05\x12\x03\x17\r\x11\n\n\n\x03\x07\
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-    \n\n\n\x03\x07\x05\x01\x12\x03\x1c\x12$\n\n\n\x03\x07\x05\x03\x12\x03\
-    \x1c',\nL\n\x02\x07\x06\x12\x03\x1e\x04*\x1aA\x20When\x20false,\x20`get_\
-    `\x20is\x20not\x20generated\x20even\x20if\x20`syntax\x20=\x20\"proto2\"`\
-    \n\n\n\n\x03\x07\x06\x02\x12\x03\x1a\x07%\n\n\n\x03\x07\x06\x04\x12\x03\
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-    \x20fields\n\n\n\n\x03\x07\x07\x02\x12\x03\x1a\x07%\n\n\n\x03\x07\x07\
-    \x04\x12\x03\x20\x04\x0c\n\n\n\x03\x07\x07\x05\x12\x03\x20\r\x11\n\n\n\
-    \x03\x07\x07\x01\x12\x03\x20\x12\x1d\n\n\n\x03\x07\x07\x03\x12\x03\x20\
-    \x20%\n3\n\x02\x07\x08\x12\x03\"\x041\x1a(\x20Use\x20`bytes::Bytes`\x20f\
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-    \x03\x07\x08\x04\x12\x03\"\x04\x0c\n\n\n\x03\x07\x08\x05\x12\x03\"\r\x11\
-    \n\n\n\x03\x07\x08\x01\x12\x03\"\x12(\n\n\n\x03\x07\x08\x03\x12\x03\"+0\
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-    \x20not\x20generated\n\n\n\n\x03\x07\t\x02\x12\x03%\x07#\n\n\n\x03\x07\t\
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-    \r\x11\n\n\n\x03\x07\n\x01\x12\x03)\x12'\n\n\n\x03\x07\n\x03\x12\x03)*/\
-    \n2\n\x02\x07\x0b\x12\x03+\x04,\x1a'\x20Use\x20`bytes::Bytes`\x20for\x20\
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-    \x0c\x12\x03-\x047\x1a(\x20Use\x20`bytes::Bytes`\x20for\x20`string`\x20f\
-    ields\n\n\n\n\x03\x07\x0c\x02\x12\x03%\x07#\n\n\n\x03\x07\x0c\x04\x12\
-    \x03-\x04\x0c\n\n\n\x03\x07\x0c\x05\x12\x03-\r\x11\n\n\n\x03\x07\x0c\x01\
-    \x12\x03-\x12.\n\n\n\x03\x07\x0c\x03\x12\x03-16\
+    FileOptionsR\x16tokioBytesForStringAll:Y\n\x19oneofs_non_exhaustive_all\
+    \x18\xf5\x84\x01\x20\x01(\x08\x12\x1c.google.protobuf.FileOptionsR\x16on\
+    eofsNonExhaustiveAll:H\n\x10lite_runtime_all\x18\x8b\x85\x01\x20\x01(\
+    \x08\x12\x1c.google.protobuf.FileOptionsR\x0eliteRuntimeAll:P\n\x12gener\
+    ate_accessors\x18\xec\x84\x01\x20\x01(\x08\x12\x1f.google.protobuf.Messa\
+    geOptionsR\x11generateAccessors:J\n\x0fgenerate_getter\x18\xed\x84\x01\
+    \x20\x01(\x08\x12\x1f.google.protobuf.MessageOptionsR\x0egenerateGetter:\
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 ";
 
 /// `FileDescriptorProto` object which was a source for this generated file