diff --git a/.config/zsh/autoload/git/git-perm-stash b/.config/zsh/autoload/git/git-perm-stash
index b90c093..4132355 100755
--- a/.config/zsh/autoload/git/git-perm-stash
+++ b/.config/zsh/autoload/git/git-perm-stash
@@ -11,7 +11,7 @@ git rev-parse
 
 idx="${1:-0}"
 stash_ref="$(git rev-parse stash@{$idx} | cut -c-$REF_LEN)"
-commit_ref="$(git rev-parse HEAD | cut -c-$REF_LEN)"
+commit_ref="$(git rev-parse stash@{$idx}~ | cut -c-$REF_LEN)"
 
 git stash show -up "$idx" > \
 	"${2:-$DIR}/${PWD//\//__}__${commit_ref}__$stash_ref.diff"