diff --git a/dtool/src/dtoolbase/pallocator.h b/dtool/src/dtoolbase/pallocator.h
index a21aa693dd..04f2b56c7e 100644
--- a/dtool/src/dtoolbase/pallocator.h
+++ b/dtool/src/dtoolbase/pallocator.h
@@ -91,7 +91,7 @@ public:
 
   // template member functions in VC++ can only be defined in-class.
   template<class U>
-  INLINE pallocator(const pallocator<U> &copy) throw() { }
+  INLINE pallocator(const pallocator<U> &) throw() { }
 
   INLINE pointer allocate(size_type n, allocator<void>::const_pointer hint = 0);
   INLINE void deallocate(void *p, size_type n);