diff --git a/tools/install/win/create_installer.bat b/tools/install/win/create_installer.bat
index 26e21a136e..270a6ee64c 100644
--- a/tools/install/win/create_installer.bat
+++ b/tools/install/win/create_installer.bat
@@ -70,7 +70,7 @@ SET BUILDDRIVE=%BUILDDIR:~,2%
 SET CP=%FPCBINDIR%\cp.exe
 FOR /F "delims='" %%F IN (%LAZSVNDIR%\ide\version.inc) DO set LAZVERSION=%%F
 FOR /F %%F IN ('svnversion.exe %LAZSVNDIR%') DO set LAZREVISION=%%F
-IF %ERRORLEVEL% NEQ 0 GOTO SVNVERERR
+IF [%LAZREVISION%] == [] GOTO SVNVERERR
 
 
 ECHO Starting at: > %LOGFILE%