diff --git a/CLIENT_DATA/setup32.ins b/CLIENT_DATA/setup32.ins
index 335afd1..19a5239 100644
--- a/CLIENT_DATA/setup32.ins
+++ b/CLIENT_DATA/setup32.ins
@@ -75,7 +75,7 @@ else
 endif
 
 [Winbatch_install]
-msiexec /i "$InstallMsi$" /l* "$LogDir$\$ProductId$.install_log.txt" /qb! ALLUSERS=1 REBOOT=ReallySuppress INSTALLDIR=$InstallDir$
+msiexec /i "$InstallMsi$" /l* "$LogDir$\$ProductId$.install_log.txt" /qb! ALLUSERS=1 REBOOT=ReallySuppress INSTALLDIR="$InstallDir$"
 
 [Files_install]
 ; copy the ini file to the InstallDir