diff --git a/src/dict.c b/src/dict.c
index 6e1d0d6..40c940e 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -54,7 +54,7 @@
 dict_alloc_id(alloc_id_T id UNUSED)
 {
 #ifdef FEAT_EVAL
-    if (alloc_fail_id == id && alloc_does_fail((long_u)sizeof(list_T)))
+    if (alloc_fail_id == id && alloc_does_fail(sizeof(list_T)))
 	return NULL;
 #endif
     return (dict_alloc());