diff --git a/base.yml b/base.yml
index 267ef32..3beae3f 100644
--- a/base.yml
+++ b/base.yml
@@ -31,7 +31,7 @@ sensor:
     ratgdo_id: ${id_prefix}
     name: "${friendly_name} Openings"
     unit_of_measurement: "openings"
-    icon: up-arrow-box
+    icon: mdi:up-arrow-box
 
 switch:
   - platform: ratgdo