diff --git a/src/vim9compile.c b/src/vim9compile.c
index 16898e3..c69afb9 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1101,7 +1101,7 @@
     int save_KeyTyped = KeyTyped;
     KeyTyped = FALSE;
 
-    ufunc = define_function(eap, lambda_name, lines_to_free, 0);
+    ufunc = define_function(eap, lambda_name, lines_to_free, 0, NULL, 0);
 
     KeyTyped = save_KeyTyped;