diff --git a/user/tb/runtime.c b/user/tb/runtime.c
index 9c2097e..f29a5c2 100644
--- a/user/tb/runtime.c
+++ b/user/tb/runtime.c
@@ -148,6 +148,7 @@ done:
   for (size_t i = 0; i < ARRLEN(prepended_args)+1; i++) {
     ufree(args1[i]);
   }
+  ufree(args1);
   ufree(s);
 
   return ok;