diff --git a/appveyor.yml b/appveyor.yml
index f83a89d91..db713de27 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -200,7 +200,7 @@ build_script:
   - ps: |
       if ($env:builder -eq "msbuild")
       {
-        $logger='C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll';
+        $logger='"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"';
         $verbosity='minimal';
     
         $process = Start-Process -PassThru -NoNewWindow -Wait -FilePath "$env:poco_base\buildwin.cmd" -RSO cout -RSE cerr `