diff --git a/dlls/jsproxy/main.c b/dlls/jsproxy/main.c
index 1ad57aa46b8..a52fbb4df7d 100644
--- a/dlls/jsproxy/main.c
+++ b/dlls/jsproxy/main.c
@@ -87,14 +87,14 @@ BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved )
     return TRUE;
 }
 
-static inline void *heap_alloc( SIZE_T size )
+static inline void* __WINE_ALLOC_SIZE(1) heap_alloc(size_t size)
 {
-    return HeapAlloc( GetProcessHeap(), 0, size );
+    return HeapAlloc(GetProcessHeap(), 0, size);
 }
 
-static inline BOOL heap_free( LPVOID mem )
+static inline BOOL heap_free(void *mem)
 {
-    return HeapFree( GetProcessHeap(), 0, mem );
+    return HeapFree(GetProcessHeap(), 0, mem);
 }
 
 static inline WCHAR *strdupAW( const char *src, int len )