diff --git a/lib/py_unit_adapter.rb b/lib/py_unit_adapter.rb
index 5347c8406..8329f2d5c 100644
--- a/lib/py_unit_adapter.rb
+++ b/lib/py_unit_adapter.rb
@@ -45,6 +45,6 @@ def parse_output(output)
       count += total_failed
     end
 
-    {count:, failed: total_failed, error_messages: assertion_error_matches.flatten.compact_blank}.compact_blank
+    {count:, failed: total_failed, error_messages: assertion_error_matches.flatten.compact_blank.sort}.compact_blank
   end
 end