diff --git a/etc/rc.d/zvol b/etc/rc.d/zvol
index 03495220f0d6..6fdc280d46d8 100755
--- a/etc/rc.d/zvol
+++ b/etc/rc.d/zvol
@@ -19,10 +19,10 @@ required_modules="zfs"
 zvol_start()
 {
 	# Enable swap on ZVOLs with property org.freebsd:swap=on.
-	zfs list -H -o org.freebsd:swap,name -t volume | \
+	zfs list -H -o org.freebsd:swap,name -t volume |
 	while read state name; do
 		case "${state}" in
-		[oO][nN])
+		([oO][nN])
 			swapon /dev/zvol/${name}
 			;;
 		esac
@@ -32,10 +32,10 @@ zvol_start()
 zvol_stop()
 {
 	# Disable swap on ZVOLs with property org.freebsd:swap=on.
-	zfs list -H -o org.freebsd:swap,name -t volume | \
+	zfs list -H -o org.freebsd:swap,name -t volume |
 	while read state name; do
 		case "${state}" in
-		[oO][nN])
+		([oO][nN])
 			swapoff /dev/zvol/${name}
 			;;
 		esac