diff --git a/check_snmp_synology b/check_snmp_synology
index 105d800b2b8ae5faae92f324dc0cf1829c9e28b5..9a572ff6d21b6a2827481e36d8836e4c15a0cf0e 100755
--- a/check_snmp_synology
+++ b/check_snmp_synology
@@ -407,10 +407,6 @@ if [ $FLAG_DISK -ne 0 ]; then
         RAIDName[$i]=$(_get $OID_RAIDName.$(($i-1)))
         iRAIDStatus=$(_get $OID_RAIDStatus.$(($i-1)))
 
-        # size in integer GB
-        iRAIDSize=$(( $(_get $OID_RAIDSize.$(($i-1))) / 1024/1024/1024 ))
-        iRAIDFree=$(( $(_get $OID_RAIDFree.$(($i-1))) / 1024/1024/1024 ))
-        iFree=$(( iRAIDFree*100/$iRAIDSize ))
         RAIDStatus[$i]=${aStatusRaid[${iRAIDStatus}]}
 
         if [ "$iRAIDStatus" != "1" ] ; then