diff --git a/sonoff/language/en-GB.h b/sonoff/language/en-GB.h
index 48641d0ff..d04832c21 100644
--- a/sonoff/language/en-GB.h
+++ b/sonoff/language/en-GB.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "IP Address"
 #define D_LIGHT "Light"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "Module"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "multi-press"