diff --git a/src/list.c b/src/list.c
index 578d6f1..88f3102 100644
--- a/src/list.c
+++ b/src/list.c
@@ -2198,7 +2198,8 @@
     if (in_vim9script()
 	    && (check_for_list_arg(argvars, 0) == FAIL
 		|| (argvars[1].v_type != VAR_UNKNOWN
-		    && check_for_opt_dict_arg(argvars, 2) == FAIL)))
+		    && (check_for_string_or_func_arg(argvars, 1) == FAIL
+			      || check_for_opt_dict_arg(argvars, 2) == FAIL))))
 	return;
 
     if (argvars[0].v_type != VAR_LIST)