diff --git a/packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem b/packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem
index eb490c41d990..f7df79d3f702 100755
--- a/packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem
+++ b/packages/bsp/common/usr/lib/armbian/armbian-resize-filesystem
@@ -25,7 +25,7 @@ do_expand_partition()
 
 	local diskdevname=$(lsblk -n -d -o PKNAME $partdev) # i.e. mmcblk0 or sda
 	# due to the bug in util-linux 2.34 which fails to show device, let's use this failover:
-	[[ -z $diskdevname ]] && diskdevname=$(echo $partdev | sed -e "s/^\/dev\///" | sed "s/p.*//")
+	[[ -z $diskdevname ]] && diskdevname=$(echo $partdev | sed -e "s/^\/dev\///" | sed -E 's/p?[0-9]+$//')
 	local diskdev="/dev/$diskdevname" # i.e. /dev/mmcblk0, /dev/sda
 	echo "diskdevname: $diskdevname"
 	echo "diskdev: $diskdev"