diff --git a/rapids/models.py b/rapids/models.py
index 996a56a2..b59f5801 100644
--- a/rapids/models.py
+++ b/rapids/models.py
@@ -39,7 +39,7 @@ def image_directory_path(instance, filename):
 
 def get_answer_compare(s):
     s = s.strip().lower()
-    s = s.translate(str.maketrans('', '', s.punctuation.replace("#", "")))
+    s = s.translate(str.maketrans('', '', string.punctuation.replace("#", "")))
     return s
 
 class Abnormality(models.Model):