diff --git a/tools/CleanupBuild.ps1 b/tools/CleanupBuild.ps1
index 75e204352765..ea9e4ee128f9 100644
--- a/tools/CleanupBuild.ps1
+++ b/tools/CleanupBuild.ps1
@@ -47,11 +47,11 @@ foreach ($RMFolder in $resourceManagerFolders)
     Write-Verbose "Removing scripts and psd1 in $($RMFolder.FullName)"
     if (Test-Path -Path "$($RMFolder.FullName)\StartupScripts")
     {
-        $scriptName = "$($RMFolder.FullName)\StartupScripts\$($RMFolder.Name.replace('.', ''))Startup.ps1"
+        $scriptName = "$($RMFolder.FullName)$([IO.Path]::DirectorySeparatorChar)StartupScripts$([IO.Path]::DirectorySeparatorChar)$($RMFolder.Name.replace('.', ''))Startup.ps1"
         Write-Verbose $scriptName
         $removedScripts = Get-ChildItem -Path "$($RMFolder.FullName)\StartupScripts" -Filter "*.ps1" | where { $_.FullName -ne $scriptName }
         $removedScripts | % { Write-Verbose "Removing $($_.FullName)"; Remove-Item $_.FullName -Force }
     }
-    $removedPsd1 = Get-ChildItem -Path "$($RMFolder.FullName)" -Filter "*.psd1" | where { $_.FullName -ne "$($RMFolder.FullName)\$($RMFolder.Name).psd1" }
+    $removedPsd1 = Get-ChildItem -Path "$($RMFolder.FullName)" -Filter "*.psd1" | where { $_.FullName -ne "$($RMFolder.FullName)$([IO.Path]::DirectorySeparatorChar)$($RMFolder.Name).psd1" }
     $removedPsd1 | % { Write-Verbose "Removing $($_.FullName)"; Remove-Item $_.FullName -Force }
 }