diff --git a/src/eval.c b/src/eval.c
index 53a651a..1daf042 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -13178,7 +13178,7 @@
 	rettv->vval.v_list = (list_T *)get_reg_contents(regname,
 				      (arg2 ? GREG_EXPR_SRC : 0) | GREG_LIST);
 	if (rettv->vval.v_list == NULL)
-	    rettv_list_alloc(rettv);
+	    (void)rettv_list_alloc(rettv);
 	else
 	    ++rettv->vval.v_list->lv_refcount;
     }