diff --git a/src/vim9execute.c b/src/vim9execute.c
index 6409d88..606ce0c 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -606,6 +606,17 @@
 	return FAIL;
     if (ufunc->uf_def_status == UF_COMPILED)
     {
+	int error = check_user_func_argcount(ufunc, argcount);
+
+	if (error != FCERR_UNKNOWN)
+	{
+	    if (error == FCERR_TOOMANY)
+		semsg(_(e_toomanyarg), ufunc->uf_name);
+	    else
+		semsg(_(e_toofewarg), ufunc->uf_name);
+	    return FAIL;
+	}
+
 	// The function has been compiled, can call it quickly.  For a function
 	// that was defined later: we can call it directly next time.
 	if (iptr != NULL)