diff --git a/tools/install/win/create_installer.bat b/tools/install/win/create_installer.bat
index ae069af6b9..6f24bfeca6 100644
--- a/tools/install/win/create_installer.bat
+++ b/tools/install/win/create_installer.bat
@@ -71,7 +71,8 @@ SET CP=%FPCBINDIR%\cp.exe
 FOR /F %%F IN ('%LAZSVNDIR%\tools\install\get_lazarus_version.bat') DO set LAZVERSION=%%F
 FOR /F %%F IN ('svnversion.exe %LAZSVNDIR%') DO set LAZREVISION=%%F
 IF [%LAZREVISION%] == [] GOTO SVNVERERR
-
+:: Remove : from revision if present
+SET LAZREVISION=%LAZREVISION::=_%
 
 ECHO Starting at: > %LOGFILE%
 %FPCBINDIR%\gdate >> %LOGFILE%