diff --git a/js/js2/gc_allocator.h b/js/js2/gc_allocator.h
index 2eb685587ef..e56b6e2dd7e 100644
--- a/js/js2/gc_allocator.h
+++ b/js/js2/gc_allocator.h
@@ -120,7 +120,7 @@ namespace JavaScript {
 		typedef const T &const_reference;
 		
 		gc_allocator() {}
-		// template<class U> gc_allocator(const gc_allocator<U>&) {}
+		template<typename U, typename UTraits> gc_allocator(const gc_allocator<U, UTraits>&) {}
 		// ~gc_allocator() {}
 		
 		static pointer address(reference r) { return &r; }
diff --git a/js2/src/gc_allocator.h b/js2/src/gc_allocator.h
index 2eb685587ef..e56b6e2dd7e 100644
--- a/js2/src/gc_allocator.h
+++ b/js2/src/gc_allocator.h
@@ -120,7 +120,7 @@ namespace JavaScript {
 		typedef const T &const_reference;
 		
 		gc_allocator() {}
-		// template<class U> gc_allocator(const gc_allocator<U>&) {}
+		template<typename U, typename UTraits> gc_allocator(const gc_allocator<U, UTraits>&) {}
 		// ~gc_allocator() {}
 		
 		static pointer address(reference r) { return &r; }