diff --git a/dsmon.sh b/dsmon.sh
index 9d8aa0a..de661a1 100755
--- a/dsmon.sh
+++ b/dsmon.sh
@@ -111,7 +111,7 @@ CHECK(){
 				dname=${DRIVEINFO[${ii}]}
 				dtot=$(bc <<< "scale=2; ${DRIVEINFO[$((${ii}+1))]}/1024/10")
 				dfree=$(bc <<< "scale=2; ${DRIVEINFO[$((${ii}+2))]}/1024/10")
-				dfreeper=$(bc <<< "scale=2; ((${DRIVEINFO[$((${ii}+2))]}/1024/10)/(${DRIVEINFO[$((${ii}+1))]}/1024/10))*100")
+				dfreeper=$(bc <<< "scale=2; (${dfree}/${dtot})*100")
 				#dname=${ia//\/dev\/mapper\//}
 				#dname=${ia//\/dev\//}