diff --git a/hooks/post-commit b/hooks/post-commit
index 3022f5b..1229f12 100755
--- a/hooks/post-commit
+++ b/hooks/post-commit
@@ -172,9 +172,9 @@ for ((i=0;; i++)); do
   TREE_HASH=$(git write-tree)
 
   declare PREIMAGE
-  get_preimage_from_tree_and_parent "$TREE_HASH" "$PEARENT_COMMIT_HASH" PREIMAGE
+  get_preimage_from_tree_and_parent "$TREE_HASH" "$PARENT_COMMIT_HASH" PREIMAGE
   declare NEW_DIGEST_TO_TIMESTAMP
-  compute_digest_from_tree_and_parent "$TREE_HASH" "$PEARENT_COMMIT_HASH" NEW_DIGEST_TO_TIMESTAMP
+  compute_digest_from_tree_and_parent "$TREE_HASH" "$PARENT_COMMIT_HASH" NEW_DIGEST_TO_TIMESTAMP
   if [ "$NEW_DIGEST_TO_TIMESTAMP" == "$DIGEST_TO_TIMESTAMP" ];then
     #no new LTV data added, no need to re-request token.
     break