diff --git a/tools/livecd-iso-to-disk.sh b/tools/livecd-iso-to-disk.sh
index 00f201a..329ce4f 100755
--- a/tools/livecd-iso-to-disk.sh
+++ b/tools/livecd-iso-to-disk.sh
@@ -99,7 +99,7 @@ resetMBR() {
 }
 
 checkMBR() {
-    if [[ "$DEV" =~ "/dev/loop*" ]]; then
+    if isdevloop "$DEV"; then
        return 0
     fi
     getdisk $1