diff --git a/Packer/scripts/compact.bat b/Packer/scripts/compact.bat
index 47ac494..de3e18e 100755
--- a/Packer/scripts/compact.bat
+++ b/Packer/scripts/compact.bat
@@ -27,6 +27,6 @@ rmdir /S /Q C:\Windows\SoftwareDistribution\Download
 mkdir C:\Windows\SoftwareDistribution\Download
 net start wuauserv
 
-cmd /c C:\Windows\Temp\ultradefrag-portable-6.1.0.amd64\udefrag.exe --optimize --repeat C:
+start /wait C:\Windows\Temp\ultradefrag-portable-6.1.0.amd64\udefrag.exe --optimize --repeat C:
 cmd /c %SystemRoot%\System32\reg.exe ADD HKCU\Software\Sysinternals\SDelete /v EulaAccepted /t REG_DWORD /d 1 /f
 cmd /c C:\Windows\Temp\sdelete.exe -q -z C: