diff --git a/src/node_buffer.h b/src/node_buffer.h
index 686450d984e6f9..29e936fa7ad534 100644
--- a/src/node_buffer.h
+++ b/src/node_buffer.h
@@ -13,7 +13,7 @@ namespace Buffer {
 static const unsigned int kMaxLength =
     sizeof(int32_t) == sizeof(intptr_t) ? 0x3fffffff : 0x7fffffff;
 
-NODE_EXTERN typedef void (*FreeCallback)(char* data, void* hint);
+typedef void (*FreeCallback)(char* data, void* hint);
 
 NODE_EXTERN bool HasInstance(v8::Local<v8::Value> val);
 NODE_EXTERN bool HasInstance(v8::Local<v8::Object> val);