diff --git a/build/pipelines/templates/run-ui-tests.yaml b/build/pipelines/templates/run-ui-tests.yaml
index 43b41a59..1f9dfcca 100644
--- a/build/pipelines/templates/run-ui-tests.yaml
+++ b/build/pipelines/templates/run-ui-tests.yaml
@@ -43,7 +43,7 @@ jobs:
       publish/**
 
   - powershell: |
-      $(BuildSourceDirectory)/build/scripts/SignTestApp.ps1 -AppToSign '$(Pipeline.Workspace)/$(DropName)/Calculator/AppPackages/Calculator_*_Test/Calculator_*.msixbundle'
+      $(Build.SourcesDirectory)/build/scripts/SignTestApp.ps1 -AppToSign '$(Pipeline.Workspace)/$(DropName)/Calculator/AppPackages/Calculator_*_Test/Calculator_*.msixbundle'
       $(Pipeline.Workspace)/$(DropName)/Calculator/AppPackages/Calculator_*_Test/Add-AppDevPackage.ps1 -Force
     displayName: Install app
 
diff --git a/build/pipelines/templates/run-unit-tests.yaml b/build/pipelines/templates/run-unit-tests.yaml
index c899f6ad..84e76ec2 100644
--- a/build/pipelines/templates/run-unit-tests.yaml
+++ b/build/pipelines/templates/run-unit-tests.yaml
@@ -22,7 +22,7 @@ jobs:
     patterns: '**/CalculatorUnitTests_Test/**'
 
   - powershell: |
-      $(Build.SourceDirectory)/build/scripts/SignTestApp.ps1 -AppToSign '$(UnitTestsDir)\CalculatorUnitTests.msix'
+      $(Build.SourcesDirectory)/build/scripts/SignTestApp.ps1 -AppToSign '$(UnitTestsDir)\CalculatorUnitTests.msix'
     displayName: Sign unit tests
 
   - task: VSTest@2