diff --git a/php/ext/google/protobuf/php-upb.h b/php/ext/google/protobuf/php-upb.h
index af3ca9af8e..dda30b595c 100644
--- a/php/ext/google/protobuf/php-upb.h
+++ b/php/ext/google/protobuf/php-upb.h
@@ -11132,7 +11132,7 @@ uint32_t upb_FieldDef_Index(const upb_FieldDef* f);
 bool upb_FieldDef_IsExtension(const upb_FieldDef* f);
 UPB_API bool upb_FieldDef_IsMap(const upb_FieldDef* f);
 bool upb_FieldDef_IsOptional(const upb_FieldDef* f);
-bool upb_FieldDef_IsPacked(const upb_FieldDef* f);
+UPB_API bool upb_FieldDef_IsPacked(const upb_FieldDef* f);
 bool upb_FieldDef_IsPrimitive(const upb_FieldDef* f);
 UPB_API bool upb_FieldDef_IsRepeated(const upb_FieldDef* f);
 bool upb_FieldDef_IsRequired(const upb_FieldDef* f);
diff --git a/ruby/ext/google/protobuf_c/ruby-upb.h b/ruby/ext/google/protobuf_c/ruby-upb.h
index 22d0fcc807..8ec4602f77 100755
--- a/ruby/ext/google/protobuf_c/ruby-upb.h
+++ b/ruby/ext/google/protobuf_c/ruby-upb.h
@@ -11534,7 +11534,7 @@ uint32_t upb_FieldDef_Index(const upb_FieldDef* f);
 bool upb_FieldDef_IsExtension(const upb_FieldDef* f);
 UPB_API bool upb_FieldDef_IsMap(const upb_FieldDef* f);
 bool upb_FieldDef_IsOptional(const upb_FieldDef* f);
-bool upb_FieldDef_IsPacked(const upb_FieldDef* f);
+UPB_API bool upb_FieldDef_IsPacked(const upb_FieldDef* f);
 bool upb_FieldDef_IsPrimitive(const upb_FieldDef* f);
 UPB_API bool upb_FieldDef_IsRepeated(const upb_FieldDef* f);
 bool upb_FieldDef_IsRequired(const upb_FieldDef* f);