diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 39e0af892..dfe5a05c4 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -38,7 +38,6 @@ jobs:
       Python35Linux:
         imageName: 'ubuntu-16.04'
         python.version: '3.5'
-        os: linux
       Python35Windows:
         imageName: 'vs2017-win2016'
         python.version: '3.5'