diff --git a/sonoff/language/he-HE.h b/sonoff/language/he-HE.h
index 355fe8231..126ad8c01 100644
--- a/sonoff/language/he-HE.h
+++ b/sonoff/language/he-HE.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "IP כתובת"
 #define D_LIGHT "אור"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "מודול"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "multi-press"