diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 002d4dffdd69..be1bd8e5f3b9 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -91,6 +91,14 @@ stages:
         python3 setup.py test
       displayName: 'Test Python 3'
 
+    - script: |
+        sudo pip3 install diff-cover
+        target_branch=$(System.PullRequest.TargetBranch)
+        compare_branch=origin/${target_branch#refs/heads/}
+        diff-cover coverage.xml --compare-branch=$compare_branch
+      condition: eq(variables['Build.Reason'], 'PullRequest')
+      displayName: "Diff coverage"
+
     - task: PublishTestResults@2
       inputs:
         testResultsFiles: '$(System.DefaultWorkingDirectory)/test-results.xml'