diff --git a/rest_framework/throttling.py b/rest_framework/throttling.py
index 56c893538..1d5799ea0 100644
--- a/rest_framework/throttling.py
+++ b/rest_framework/throttling.py
@@ -108,7 +108,7 @@ class SimpleRateThrottle(BaseThrottle):
             return (None, None)
         num, period = rate.split('/')
         num_requests = int(num)
-        
+
         denominator = period[:-1]
         m = re.search(self._RATE_DENOMINATOR_REGEX, denominator)
         dg = m.groups()