diff --git a/src/Microsoft.DotNet.Helix/Sdk/tools/xharness-runner/xharness-event-reporter.py b/src/Microsoft.DotNet.Helix/Sdk/tools/xharness-runner/xharness-event-reporter.py
index 92d161eaf3e..cd4b1625194 100644
--- a/src/Microsoft.DotNet.Helix/Sdk/tools/xharness-runner/xharness-event-reporter.py
+++ b/src/Microsoft.DotNet.Helix/Sdk/tools/xharness-runner/xharness-event-reporter.py
@@ -41,6 +41,8 @@
             custom_dimensions['target'] = operation['target'] + '_' + operation['targetOS']
         else:
             custom_dimensions['target'] = operation['target']
+    elif 'targetOS' in operation:
+        custom_dimensions['target'] = operation['targetOS']
 
     app_insights.send_metric('XHarnessOperation', operation['exitCode'], properties=custom_dimensions)
     app_insights.send_metric('XHarnessOperationDuration', operation['duration'], properties=custom_dimensions)