diff --git a/sonoff/language/de-DE.h b/sonoff/language/de-DE.h
index 0c2ab9f6a..0516a40ec 100644
--- a/sonoff/language/de-DE.h
+++ b/sonoff/language/de-DE.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "IP-Adresse"
 #define D_LIGHT "Licht"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "Modul"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "Mehrfachdruck"