diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 78f1e9926..5cde6ba67 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -646,7 +646,7 @@ stages:
         7z x boost_${env:BOOST_VERSION_U}.zip
         cd boost_${env:BOOST_VERSION_U}
         echo "using" "msvc" ";" > ${env:HOME}/user-config.jam
-        ${env:BUILD_SOURCESDIRECTORY}/src/engine/b2.exe "--boost-build=${env:BUILD_SOURCESDIRECTORY}/src" --debug-configuration --build-type=complete --layout=versioned -n -d1 toolset=msvc install
+        "${env:BUILD_SOURCESDIRECTORY}\src\engine\b2.exe" "--boost-build=${env:BUILD_SOURCESDIRECTORY}/src" --debug-configuration --build-type=complete --layout=versioned -n -d1 toolset=msvc install
       displayName: Test
 
 - stage: WebsiteUpdate