diff --git a/common/btrfs b/common/btrfs
index 19ac7cc4b..85b33e4c0 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -7,7 +7,7 @@ _btrfs_get_subvolid()
 	mnt=$1
 	name=$2
 
-	$BTRFS_UTIL_PROG sub list $mnt | grep $name | awk '{ print $2 }'
+	$BTRFS_UTIL_PROG sub list $mnt | egrep "\s$name$" | awk '{ print $2 }'
 }
 
 # _require_btrfs_command <command> [<subcommand>|<option>]