diff --git a/sonoff/language/es-AR.h b/sonoff/language/es-AR.h
index a5d044985..8a6ffede3 100644
--- a/sonoff/language/es-AR.h
+++ b/sonoff/language/es-AR.h
@@ -110,6 +110,7 @@
 #define D_IP_ADDRESS "Dirección IP"
 #define D_LIGHT "Luz"
 #define D_LWT "LWT"
+#define D_MMHG "mmHg"
 #define D_MODULE "Módulo"
 #define D_MQTT "MQTT"
 #define D_MULTI_PRESS "multi-press"