diff --git a/lib/matrix.rb b/lib/matrix.rb
index 9d32768e2..b300c2fd6 100755
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -163,7 +163,7 @@ def create_stats_matrix(result_root)
                  elsif event_counter? k
                    v[-1] - v[0]
                  else
-                   v.sum / stats_part_len
+                   v.sum.to_f / stats_part_len
                  end
       stats["#{k}.max"] = v.max if should_add_max_latency k
     end