diff --git a/src/folder.c b/src/folder.c
index 78cae2d17..bfd444116 100644
--- a/src/folder.c
+++ b/src/folder.c
@@ -46,7 +46,7 @@ char *get_exec_path ()
 
   #elif defined (__APPLE__)
 
-  size_t size = exec_path_len;
+  u32 size = (u32) exec_path_len;
 
   if (_NSGetExecutablePath (exec_path, &size) != 0)
   {