diff --git a/paddle/memory/memory.h b/paddle/memory/memory.h
index c4fe1e52203d6f028416a244e8818922dffff4fe..d0a64869cc3bcfa58b7e125e5d5699e6753396bf 100644
--- a/paddle/memory/memory.h
+++ b/paddle/memory/memory.h
@@ -28,7 +28,7 @@ void Free(Place, void*);
 template <class Place>
 size_t Used(Place);
 
-template <typename T,
+template <typename T, /* must be POD types */
           typename Place /* platform::GPUPlace or platform::CPUPlace */,
           typename std::enable_if<std::is_pod<T>::value>::type* = nullptr>
 class PODDeleter {