diff --git a/Tools/zip_files.ps1 b/Tools/zip_files.ps1
index 75c70ff2..f9cbdfb5 100644
--- a/Tools/zip_files.ps1
+++ b/Tools/zip_files.ps1
@@ -69,7 +69,7 @@ if ($ConfigurationName -eq "Release Portable") {
     if(!([string]::IsNullOrEmpty($Env:APPVEYOR_BUILD_FOLDER))) {
         $outputZipPath = Join-Path -Path $SolutionDir -ChildPath "Release\mRemoteNG-Portable-$($version).zip"
         #7z a -spf $outputZipPath $Source
-        7z a -bt -bd -bb1 -mx=9 -tzip -y -r $PortableZip $Source
+        7z a -bt -bd -bb1 -mx=9 -tzip -y -r $PortableZip "$($Source)"
     }
     # Local build
     else {