diff --git a/cli/tests/complete_word.rs b/cli/tests/complete_word.rs
index be57e6c..230e3b6 100644
--- a/cli/tests/complete_word.rs
+++ b/cli/tests/complete_word.rs
@@ -70,6 +70,11 @@ fn complete_word_shebang() {
     assert_cmd("example.sh", &["--", "-"]).stdout("--bar\n--defaulted\n--foo\n");
 }
 
+#[test]
+fn complete_word_arg_completer() {
+    assert_cmd("example.sh", &["--", "v"]).stdout("val-1\nval-2\nval-3\n");
+}
+
 #[test]
 fn complete_word_mounted() {
     let mut path = env::split_paths(&env::var("PATH").unwrap()).collect::<Vec<_>>();
diff --git a/examples/example.sh b/examples/example.sh
index b518c17..e0e82bc 100755
--- a/examples/example.sh
+++ b/examples/example.sh
@@ -4,7 +4,8 @@
 #USAGE flag "--foo" help="Flag value"
 #USAGE flag "--bar <bar>" help="Option value"
 #USAGE flag "--defaulted <defaulted>" default="mydefault" help="Defaulted value"
-#USAGE arg "baz" help="Positional values"
+#USAGE arg "baz" help="Positional values" default="mydefault"
+#USAGE complete "baz" run="echo val-1; echo val-2; echo val-3"
 #USAGE min_usage_version "1"
 set -eo pipefail
 
diff --git a/lib/src/parse.rs b/lib/src/parse.rs
index b66ae85..15829f4 100644
--- a/lib/src/parse.rs
+++ b/lib/src/parse.rs
@@ -31,8 +31,27 @@ pub enum ParseValue {
 }
 
 pub fn parse(spec: &Spec, input: &[String]) -> Result<ParseOutput, miette::Error> {
-    let out = parse_partial(spec, input)?;
+    let mut out = parse_partial(spec, input)?;
     trace!("{out:?}");
+    for arg in out.cmd.args.iter().skip(out.args.len()) {
+        if let Some(default) = arg.default.as_ref() {
+            out.args
+                .insert(arg.clone(), ParseValue::String(default.clone()));
+        }
+    }
+    for flag in out.available_flags.values() {
+        if out.flags.contains_key(flag) {
+            continue;
+        }
+        if let Some(default) = flag.default.as_ref() {
+            out.flags
+                .insert(flag.clone(), ParseValue::String(default.clone()));
+        }
+        if let Some(Some(default)) = flag.arg.as_ref().map(|a| &a.default) {
+            out.flags
+                .insert(flag.clone(), ParseValue::String(default.clone()));
+        }
+    }
     if let Some(err) = out.errors.iter().find(|e| matches!(e, UsageErr::Help(_))) {
         bail!("{err}");
     }
@@ -235,10 +254,7 @@ pub fn parse_partial(spec: &Spec, input: &[String]) -> Result<ParseOutput, miett
     }
 
     for arg in out.cmd.args.iter().skip(out.args.len()) {
-        if let Some(default) = &arg.default {
-            out.args
-                .insert(arg.clone(), ParseValue::String(default.clone()));
-        } else if arg.required {
+        if arg.required && arg.default.is_none() {
             out.errors.push(UsageErr::MissingArg(arg.name.clone()));
         }
     }
@@ -247,15 +263,8 @@ pub fn parse_partial(spec: &Spec, input: &[String]) -> Result<ParseOutput, miett
         if out.flags.contains_key(flag) {
             continue;
         }
-        if let Some(default) = flag.default.as_ref() {
-            out.flags
-                .insert(flag.clone(), ParseValue::String(default.clone()));
-        }
-        if let Some(Some(default)) = flag.arg.as_ref().map(|a| &a.default) {
-            out.flags
-                .insert(flag.clone(), ParseValue::String(default.clone()));
-        }
-        if flag.required {
+        let has_default = flag.default.is_some() || flag.arg.iter().any(|a| a.default.is_some());
+        if flag.required && !has_default {
             out.errors.push(UsageErr::MissingFlag(flag.name.clone()));
         }
     }