diff --git a/src/version.c b/src/version.c
index ce8273f483..87bc2a09ed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2943,
 /**/
     2942,
 /**/
diff --git a/src/vim9execute.c b/src/vim9execute.c
index c2a7de50d6..455a205070 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -4234,7 +4234,8 @@ call_def_function(
 	    semsg(_(e_nr_arguments_too_many), idx);
 	goto failed_early;
     }
-    else if (idx < 0)
+    idx = argc - ufunc->uf_args.ga_len + ufunc->uf_def_args.ga_len;
+    if (idx < 0)
     {
 	if (idx == -1)
 	    emsg(_(e_one_argument_too_few));