diff --git a/appveyor-build.bat b/appveyor-build.bat
index 25912847c..cf23226ab 100644
--- a/appveyor-build.bat
+++ b/appveyor-build.bat
@@ -6,5 +6,5 @@ bash -c ./appveyor-build.sh
 
 REM Check if this build should set up a debugging session
 IF "%ENABLE_RDP%"=="1" (
-    powershell $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+    powershell -command  "$blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))"
 )