diff --git a/models/User.py b/models/User.py
index b6da043..2edd094 100644
--- a/models/User.py
+++ b/models/User.py
@@ -125,7 +125,9 @@ class User(Document):
     def save(self, *args, **kwargs):
         if self.union:
             self.member_no = User.objects.filter(union=self.union).count()
-        self.password = generate_password_hash(self.password)
+
+        if self.password.find('pbkdf2:') == -1:
+            self.password = generate_password_hash(self.password)