diff --git a/pandora/sequence/extract.py b/pandora/sequence/extract.py
index 47697c65..85a73fcd 100644
--- a/pandora/sequence/extract.py
+++ b/pandora/sequence/extract.py
@@ -49,7 +49,7 @@ def get_hash(image, mode):
     image_hash = hex(image_hash)[2:].upper()
     if image_hash.endswith('L'):
         image_hash = image_hash[:-1]
-    image_hash = '0' * (16 - len(h)) + h
+    image_hash = '0' * (16 - len(image_hash)) + image_hash
     return image_hash
 
 def get_sequences(path, position=0):