diff --git a/src/usbinstall.sh b/src/usbinstall.sh
index 2dd1378..0e86df8 100644
--- a/src/usbinstall.sh
+++ b/src/usbinstall.sh
@@ -209,6 +209,8 @@ fi
 
 set_status $"Partitioning $SELECT_USB..."
 echo $"Partitioning $SELECT_USB..."
+# Wipe any old GPT table or grub-install may fail due to mmultiple partition labels
+sudo dd if=/dev/zero of=$SELECT_USB bs=512 count=2047 skip=1
 # Start from a new partition table
 sudo parted -s $SELECT_USB mktable msdos &>>$LOGFILE
 if [ "$?" != "0" ]; then