diff --git a/src/ebusd/mqtthandler.cpp b/src/ebusd/mqtthandler.cpp
index 873e7e958..e3b9bba6e 100755
--- a/src/ebusd/mqtthandler.cpp
+++ b/src/ebusd/mqtthandler.cpp
@@ -91,7 +91,7 @@ static vector<string> g_topicStrs;
 /** the MQTT topic field parts. */
 static vector<string> g_topicFields;
 static bool g_retain = false;             //!< whether to retail all topics
-static OutputFormat g_publishFormat = 0;  //!< the OutputFormat for publishing messages
+static OutputFormat g_publishFormat = OF_NONE;  //!< the OutputFormat for publishing messages
 #if (LIBMOSQUITTO_VERSION_NUMBER >= 1003001)
 static bool g_logFromLib = false;         //!< log library events
 #endif