diff --git a/asv_bench/benchmarks/groupby.py b/asv_bench/benchmarks/groupby.py
index a84a5373651bb..f1ac09b8b2516 100644
--- a/asv_bench/benchmarks/groupby.py
+++ b/asv_bench/benchmarks/groupby.py
@@ -212,7 +212,7 @@ class groupby_indices(object):
     def setup(self):
         try:
             self.rng = date_range('1/1/2000', '12/31/2005', freq='H')
-            (year, month, day) = (self.rng.year, self.rng.month, self.rng.day)
+            (self.year, self.month, self.day) = (self.rng.year, self.rng.month, self.rng.day)
         except:
             self.rng = date_range('1/1/2000', '12/31/2000', offset=datetools.Hour())
             self.year = self.rng.map((lambda x: x.year))
@@ -1690,4 +1690,4 @@ def setup(self):
         self.s = Series(np.tile(self.uniques, (self.N // self.K)))
 
     def time_series_value_counts_strings(self):
-        self.s.value_counts()
\ No newline at end of file
+        self.s.value_counts()