diff --git a/wled00/const.h b/wled00/const.h
index af6a8088..9ddc2b5b 100644
--- a/wled00/const.h
+++ b/wled00/const.h
@@ -165,6 +165,7 @@
 #define REALTIME_MODE_ARTNET      6
 #define REALTIME_MODE_TPM2NET     7
 #define REALTIME_MODE_DDP         8
+#define REALTIME_MODE_DMX         9
 
 //realtime override modes
 #define REALTIME_OVERRIDE_NONE    0
diff --git a/wled00/json.cpp b/wled00/json.cpp
index 0bc81d98..cab376d7 100644
--- a/wled00/json.cpp
+++ b/wled00/json.cpp
@@ -747,6 +747,7 @@ void serializeInfo(JsonObject root)
     case REALTIME_MODE_ARTNET:   root["lm"] = F("Art-Net"); break;
     case REALTIME_MODE_TPM2NET:  root["lm"] = F("tpm2.net"); break;
     case REALTIME_MODE_DDP:      root["lm"] = F("DDP"); break;
+    case REALTIME_MODE_DMX:      root["lm"] = F("DMX"); break;
   }
 
   if (realtimeIP[0] == 0)