diff --git a/appveyor.yml b/appveyor.yml
index 11e48bf27..3c9c81dda 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,7 +34,7 @@ test_script:
       # FullCLR
       Import-Module .\PowerShellGithubDev.psm1
       $testResultsFile = ".\TestsResults.FullCLR.xml"
-      Start-DevPSGithub -binDir $pwd\binFull -NoNewWindow -ArgumentList '-command', 'Import-Module .\test\Pester; Invoke-Pester test/fullCLR -OutputFormat NUnitXml -OutputFile $testResultsFile'
+      Start-DevPSGithub -binDir $pwd\binFull -NoNewWindow -ArgumentList '-command', "Import-Module .\test\Pester; 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))
       # we want to fail the build, if these tests failed
       $x = [xml](cat -raw .\TestsResults.FullCLR.xml)