diff --git a/bitfield/forms.py b/bitfield/forms.py
index bbb9031..e4ea6e8 100644
--- a/bitfield/forms.py
+++ b/bitfield/forms.py
@@ -9,14 +9,14 @@ def render(self, name, value, attrs=None, choices=()):
         if isinstance(value, BitHandler):
             value = [k for k, v in value if v]
         elif isinstance(value, int):
-            real_value=[]
-            div=2
-            for (k,v) in self.choices:
+            real_value = []
+            div = 2
+            for (k, v) in self.choices:
                 if value % div != 0:
                     real_value.append(k)
                     value -= (value % div)
-                div*=2
-            value=real_value
+                div *= 2
+            value = real_value
         return super(BitFieldCheckboxSelectMultiple, self).render(
             name, value, attrs=attrs, choices=enumerate(choices))