diff --git a/modprobe_old_kernel.sh b/modprobe_old_kernel.sh
index f6409cdcff25af379373cd3973c84e71e781ad2e..490302fde8cea23f6e8f2169311615d5f44c7f98 100755
--- a/modprobe_old_kernel.sh
+++ b/modprobe_old_kernel.sh
@@ -22,7 +22,7 @@ set kernel_pkg                                                                \
 set tempdir (mktemp -d || exit)
 cd $tempdir
 
-function on_exit_rm_tempdir --on-event fish_exit
+function _t-nil__modprobe_old_kernel__on_exit_rm_tempdir --on-event fish_exit
   prevd
   rm -rf $tempdir
 end