diff --git a/src/option.c b/src/option.c
index 816837d..07a9e52 100644
--- a/src/option.c
+++ b/src/option.c
@@ -7370,6 +7370,8 @@
 
     free_callback(optcb);
     set_callback(optcb, &cb);
+    if (cb.cb_free_name)
+	vim_free(cb.cb_name);
     free_tv(tv);
 
     // when using Vim9 style "import.funcname" it needs to be expanded to