diff --git a/engine/baml-lib/jsonish/src/tests/test_unions.rs b/engine/baml-lib/jsonish/src/tests/test_unions.rs
index b8619022b..dbdacbf7d 100644
--- a/engine/baml-lib/jsonish/src/tests/test_unions.rs
+++ b/engine/baml-lib/jsonish/src/tests/test_unions.rs
@@ -288,3 +288,14 @@ test_deserializer!(
     ]),
     "1 cup unsalted butter, room temperature"
 );
+
+test_deserializer!(
+    test_ignore_int_if_string_in_union,
+    "",
+    "1 cup unsalted butter, room temperature",
+    FieldType::Union(vec![
+        FieldType::Primitive(TypeValue::Int),
+        FieldType::Primitive(TypeValue::String),
+    ]),
+    "1 cup unsalted butter, room temperature"
+);