diff --git a/core/blocky/list-sonos.txt b/core/blocky/list-sonos.txt
index 246325e..78ff3d3 100644
--- a/core/blocky/list-sonos.txt
+++ b/core/blocky/list-sonos.txt
@@ -1,2 +1,2 @@
 # Block Sonos devices from phoning home and allowing remote access
-(^|\.)sonos\.com$
+/(^|\.)sonos\.com$/