diff --git a/kvmstats.sh b/kvmstats.sh
index 393c773..8be1242 100644
--- a/kvmstats.sh
+++ b/kvmstats.sh
@@ -1,33 +1,33 @@
 #!/bin/sh
 
 usage () {
-	echo 'usage: kvmstats.sh [-u K|M|G]'
-	exit 1
+    echo 'usage: kvmstats.sh [-u K|M|G]'
+    exit 1
 }
 
 POW=$(echo 1024 ^ 3 | bc)
 while echo $1 | grep -q '^-[[:alnum:]]'
 do
-	case $1 in
-	'-u')
-		case $2 in
-		'K')
-			POW=$(echo 1024 ^ 1 | bc)
-			;;
-		'M')
-			POW=$(echo 1024 ^ 2 | bc)
-			;;
-		'G')
-			POW=$(echo 1024 ^ 3 | bc)
-			;;
-		*)
-			usage
-		esac
-		;;
-	*)
-		usage
-	esac
-	shift
+    case $1 in
+    '-u')
+        case $2 in
+        'K')
+            POW=$(echo 1024 ^ 1 | bc)
+            ;;
+        'M')
+            POW=$(echo 1024 ^ 2 | bc)
+            ;;
+        'G')
+            POW=$(echo 1024 ^ 3 | bc)
+            ;;
+        *)
+            usage
+        esac
+        ;;
+    *)
+        usage
+    esac
+    shift
 done
 
 # since libvirt seems to store memoy in KiB, POW must be lowered by 1
@@ -35,11 +35,11 @@ POW=$(expr $POW / 1024)
 
 for DEP in hxselect lvs tempfile
 do
-	if [ -z "$(which $DEP)" ]
-	then
-		echo "kvmstats.sh: $DEP not found in \$PATH" 1>&2
-		exit 1
-	fi
+    if [ -z "$(which $DEP)" ]
+    then
+        echo "kvmstats.sh: $DEP not found in \$PATH" 1>&2
+        exit 1
+    fi
 done
 
 TMPFILE=$(tempfile)
@@ -55,14 +55,14 @@ do
     do
         case $DEV in
         /dev/drbd/*)
-		DISK=$(cat $LVSOUT | awk "/$VM/ { ans += \$NF } END { print ans / 1024 ^ 3 }")
-		;;
+            DISK=$(cat $LVSOUT | awk "/$VM/ { ans += \$NF } END { print ans / 1024 ^ 3 }")
+            ;;
         *.qcow2)
-		DISK=$(du -sBG $DEV | awk '{ print substr($1, 0, length($1) - 1) }')
-		;;
+            DISK=$(du -sBG $DEV | awk '{ print substr($1, 0, length($1) - 1) }')
+            ;;
         *)
-		DISK=0
-        esac
+            DISK=0
+            esac
     done
     echo $VM $VCPU $RAM $DISK
 done >$TMPFILE