diff --git a/install-dsmon.sh b/install-dsmon.sh
index 42610bd..32d5517 100755
--- a/install-dsmon.sh
+++ b/install-dsmon.sh
@@ -55,7 +55,7 @@ for ((i = 0 ; i <= $((${NUMDRIVES}-1)) ; i++)); do
 	else
 		#echo "${ia};${ib};${ic}"
 		
-		THRESHOLDSPACE=$(bc <<< "scale=2; $TOTALSPACE*.8")
+		THRESHOLDSPACE=$(bc <<< "scale=2; ${ib}*.8")
 		
 		echo -e "${idsCL[LightCyan]}(${ia}) total size: ${idsCL[LightGreen]}${ib}GB${idsCL[Default]}"
 		echo -e "${idsCL[LightCyan]}Using the default threshold of 80% would alert at: ${idsCL[LightGreen]}${THRESHOLDSPACE}GB${idsCL[Default]}"