diff --git a/src/base/statistics.hh b/src/base/statistics.hh
index 9c10164a9c..529871dc4f 100644
--- a/src/base/statistics.hh
+++ b/src/base/statistics.hh
@@ -1361,9 +1361,8 @@ class DistStor
         if (val > max_val)
             max_val = val;
 
-        Counter sample = val * number;
-        sum += sample;
-        squares += sample * sample;
+        sum += val * number;
+        squares += val * val * number;
         samples += number;
     }