diff --git a/packages/tools/syslinux/files/create_livestick b/packages/tools/syslinux/files/create_livestick
index 08ee3c72a5..85e0fa8800 100755
--- a/packages/tools/syslinux/files/create_livestick
+++ b/packages/tools/syslinux/files/create_livestick
@@ -44,7 +44,7 @@ fi
 DISK="$1"
 
 ### If DISK ends with a number, add "p1" instead of "1" for the first partition
-case "${DISK: -1:1}" in
+case ${DISK#${DISK%?}} in
     ([0-9]) PART="${DISK}p1";;
     (*)     PART="${DISK}1";;
 esac