diff --git a/sonoff/language/it-IT.h b/sonoff/language/it-IT.h
index 8449d250d..9884c050a 100644
--- a/sonoff/language/it-IT.h
+++ b/sonoff/language/it-IT.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "Indirizzo IP"
 #define D_LIGHT "Luce"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "Modulo"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "multi-pressione"