diff --git a/histogram.hpp b/histogram.hpp
index 750a9f4..a031127 100644
--- a/histogram.hpp
+++ b/histogram.hpp
@@ -128,7 +128,7 @@
             return 0;
         return buckets_[idx];
     }
-    
+
     void Assign(Histogram<ValueType>* out)
     {
         out->num_entries_ = num_entries_;
@@ -172,7 +172,7 @@
     {
         return num_entries_ == 0;
     }
-    
+
     int num_entries_;
     std::vector<ValueType> samples_;
     int num_low_outliers_, num_high_outliers_;