diff --git a/sonoff/language/nl-NL.h b/sonoff/language/nl-NL.h
index afaf9d08a..2025b6912 100644
--- a/sonoff/language/nl-NL.h
+++ b/sonoff/language/nl-NL.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "IP Adres"
 #define D_LIGHT "Licht"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "Module"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "meervoudig"