diff --git a/src/vim9execute.c b/src/vim9execute.c
index adfb920..f805dc0 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -4988,8 +4988,9 @@
     estack_pop();
     current_sctx = save_current_sctx;
 
-    // TODO: when is it safe to delete the function if it is no longer used?
-    --ufunc->uf_calls;
+    if (--ufunc->uf_calls <= 0 && ufunc->uf_refcount <= 0)
+	// Function was unreferenced while being used, free it now.
+	func_clear_free(ufunc, FALSE);
 
     if (*msg_list != NULL && saved_msg_list != NULL)
     {