diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01ffb5b..bcbba08 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.2.1
+
+* Prevent raising `ZeroDivisionError`
+
 ## 0.2.0
 
 * Add support for Rails 5
diff --git a/lib/minitest/test_profile/reporter.rb b/lib/minitest/test_profile/reporter.rb
index a779f92..e2dd3fa 100644
--- a/lib/minitest/test_profile/reporter.rb
+++ b/lib/minitest/test_profile/reporter.rb
@@ -43,6 +43,7 @@ def slow_tests_total_time
       end
 
       def ratio
+        return 0.0 if @calculated_total_time == 0
         (slow_tests_total_time / @calculated_total_time) * 100
       end