diff --git a/check_rc_upgrade.sh b/check_rc_upgrade.sh
index 083f16b..104729e 100755
--- a/check_rc_upgrade.sh
+++ b/check_rc_upgrade.sh
@@ -17,6 +17,7 @@ DEBUG=0
 [ -f "$0.local" ] && source "$0.local" && [ $DEBUG -eq 1 ] && echo "Import local config file : $0.local"
 
 current=`egrep "define.*RCMAIL_VERSION" $RC_HOME/program/include/iniset.php|sed "s/define('.*', '\([^']*\)'.*$/\1/"`
+current="`echo $current|sed 's/-rc$//'`"
 [ $DEBUG -eq 1 ] && echo "Current : $current"
 
 for i in `seq 1 $MAX_CHECK`