diff --git a/appveyor.yml b/appveyor.yml
index 39ce3895cf..357ddd1f2d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,13 +34,13 @@ test_script:
       #
       # CoreCLR
       $testResultsFile = ".\TestsResults.xml"
-      .\bin\powershell.exe --noprofile -c "Invoke-Pester test/powershell -OutputFormat NUnitXml -OutputFile $testResultsFile"
+      .\bin\powershell.exe --noprofile -c "Import-Module .\bin\Modules\Microsoft.PowerShell.Platform; Invoke-Pester test/powershell -OutputFormat NUnitXml -OutputFile $testResultsFile"
       (New-Object 'System.Net.WebClient').UploadFile("https://ci.appveyor.com/api/testresults/nunit/$($env:APPVEYOR_JOB_ID)", (Resolve-Path $testResultsFile))
       #
       # FullCLR
       Import-Module .\PowerShellGitHubDev.psm1
       $testResultsFile = ".\TestsResults.FullCLR.xml"
-      Start-DevPSGitHub -binDir $pwd\binFull -NoNewWindow -ArgumentList '-command', "Import-Module .\bin\Modules\Pester; Invoke-Pester test/fullCLR -OutputFormat NUnitXml -OutputFile $testResultsFile"
+      Start-DevPSGitHub -binDir $pwd\binFull -NoNewWindow -ArgumentList '-command', "Import-Module .\bin\Modules\Pester; Import-Module .\bin\Modules\Microsoft.PowerShell.Platform; Invoke-Pester test/fullCLR -OutputFormat NUnitXml -OutputFile $testResultsFile"
       (New-Object 'System.Net.WebClient').UploadFile("https://ci.appveyor.com/api/testresults/nunit/$($env:APPVEYOR_JOB_ID)", (Resolve-Path $testResultsFile))
       #
       # Fail the build, if tests failed