diff --git a/src/list.c b/src/list.c
index 0c21c41..e7f27eb 100644
--- a/src/list.c
+++ b/src/list.c
@@ -92,7 +92,7 @@
 list_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 (list_alloc());
@@ -122,7 +122,7 @@
 rettv_list_alloc_id(typval_T *rettv, 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 FAIL;
 #endif
     return rettv_list_alloc(rettv);