diff --git a/src/caffe/syncedmem.cpp b/src/caffe/syncedmem.cpp
index ec4665ecdda..4d3564172ab 100644
--- a/src/caffe/syncedmem.cpp
+++ b/src/caffe/syncedmem.cpp
@@ -97,6 +97,7 @@ const void* SyncedMemory::gpu_data() {
   return (const void*)gpu_ptr_;
 #else
   NO_GPU;
+  return NULL;
 #endif
 }
 
@@ -133,6 +134,7 @@ void* SyncedMemory::mutable_gpu_data() {
   return gpu_ptr_;
 #else
   NO_GPU;
+  return NULL;
 #endif
 }