diff --git a/ruby/ext/google/protobuf_c/ruby-upb.h b/ruby/ext/google/protobuf_c/ruby-upb.h
index 5bd47a5..d6f1f7d 100755
--- a/ruby/ext/google/protobuf_c/ruby-upb.h
+++ b/ruby/ext/google/protobuf_c/ruby-upb.h
@@ -12023,9 +12023,10 @@
 
 #define kUpb_Message_Begin -1
 
-bool upb_Message_Next(const upb_Message* msg, const upb_MessageDef* m,
-                      const upb_DefPool* ext_pool, const upb_FieldDef** f,
-                      upb_MessageValue* val, size_t* iter);
+UPB_API bool upb_Message_Next(const upb_Message* msg, const upb_MessageDef* m,
+                              const upb_DefPool* ext_pool,
+                              const upb_FieldDef** f, upb_MessageValue* val,
+                              size_t* iter);
 
 // Clears all unknown field data from this message and all submessages.
 UPB_API bool upb_Message_DiscardUnknown(upb_Message* msg,