diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index c2a8eabea..46ac9bc18 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -28,6 +28,7 @@ jobs:
   pool:
     vmImage: "Ubuntu-16.04"
   steps:
+    - script: sudo apt-get install ninja-build
     - script: |
         mkdir build
         cd build