diff --git a/src/base_object.h b/src/base_object.h
index da49eacb647..ad5a3194007 100644
--- a/src/base_object.h
+++ b/src/base_object.h
@@ -128,11 +128,6 @@ class BaseObject : public MemoryRetainer {
   // a BaseObjectPtr to this object.
   inline void Detach();
 
-  static inline v8::Local<v8::FunctionTemplate> GetConstructorTemplate(
-      Environment* env);
-  static v8::Local<v8::FunctionTemplate> GetConstructorTemplate(
-      IsolateData* isolate_data);
-
   // Interface for transferring BaseObject instances using the .postMessage()
   // method of MessagePorts (and, by extension, Workers).
   // GetTransferMode() returns a transfer mode that indicates how to deal with