diff --git a/.azure/scripts/test.yml b/.azure/scripts/test.yml
index c67cdcc2a..79093f4f8 100644
--- a/.azure/scripts/test.yml
+++ b/.azure/scripts/test.yml
@@ -9,7 +9,7 @@ steps:
     version: 11
 
 - script: |
-    python -m pip install --upgrade pytest setuptools
+    python -m pip install --upgrade pytest-xdist setuptools
     python setup.py build_ext --inplace
   displayName: 'Build module'
 
@@ -24,7 +24,8 @@ steps:
   displayName: 'Install test'
 
 - script: |
-    python -m pytest -v --junit-xml=build/test/test.xml test/jpypetest --checkjni
+    # run tests in two workers.
+    python -m pytest -v -n 2 --junit-xml=build/test/test.xml test/jpypetest --checkjni
   displayName: 'Test JDK 11'
   condition: eq(variables['jpypetest.fast'], 'false')