diff --git a/include/ntapi/nt_object.h b/include/ntapi/nt_object.h
index 995b5f9..f6a97b4 100644
--- a/include/ntapi/nt_object.h
+++ b/include/ntapi/nt_object.h
@@ -482,7 +482,7 @@ typedef int32_t __stdcall ntapi_zw_query_directory_object(
 	__in		int32_t		return_single_entry,
 	__in		int32_t		return_scan,
 	__in_out	uint32_t *	context,
-	__out		size_t *	returned_length);
+	__out		uint32_t *	returned_length);
 
 
 typedef int32_t __stdcall ntapi_zw_create_symbolic_link_object(