diff --git a/parallel_hashmap/phmap_fwd_decl.h b/parallel_hashmap/phmap_fwd_decl.h
index 9f4ae5f..9cf8dbc 100644
--- a/parallel_hashmap/phmap_fwd_decl.h
+++ b/parallel_hashmap/phmap_fwd_decl.h
@@ -36,7 +36,7 @@
 
 namespace std 
 {
-    template<class> class allocator;
+    template<class T> class allocator;
     template<class T1, class T2> struct pair;
 }