diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 7e7f2081..268260e8 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -21,7 +21,7 @@ jobs:
       libqt5opengl5-dev libglu1-mesa-dev libunarr-dev qtdeclarative5-dev
     displayName: 'Install dependencies'
   - script: |
-      qmake CONFIG+="unarr" DEFINES+="BUILD_NUMBER \\\"$(buildNumber)\\\""
+      qmake CONFIG+="unarr" DEFINES+=\\"BUILD_NUMBER \\\"$(buildNumber)\\\"\\"
       make
     displayName: 'Build'
 - job: MacOS
@@ -73,7 +73,7 @@ jobs:
   - script: |
       call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
       set PATH=%PATH%;C:\Qt\Qt5.12.4\5.12.4\msvc2017_64\bin
-      qmake CONFIG+="7zip" DEFINES+="BUILD_NUMBER \\\"$(buildNumber)\\\""
+      qmake CONFIG+="7zip" DEFINES+=\\"BUILD_NUMBER \\\"$(buildNumber)\\\"\\"
       nmake
     displayName: 'Build'
   - script: |