diff --git a/src/etc/rust_types.py b/src/etc/rust_types.py
index 1ed68458ae3a..ca462654e44e 100644
--- a/src/etc/rust_types.py
+++ b/src/etc/rust_types.py
@@ -130,4 +130,4 @@ def classify_union(fields: List) -> RustType:
         assert len(fields) == 1
         return RustType.CompressedEnum
     else:
-        return RustType.RegularEnum
+        return RustType.Union