diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index eb0fd435..81d458d7 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -10,7 +10,7 @@ jobs:
 
 - job: 'Test'
   pool:
-    vmImage: 'Ubuntu-18.04'
+    vmImage: 'Ubuntu-16.04'
   strategy:
     matrix:
       Python27: