diff --git a/src/setting_defines.h b/src/setting_defines.h
--- a/src/setting_defines.h
+++ b/src/setting_defines.h
@@ -40,4 +40,7 @@ const char SG_Port_DataBits[] = "dataBit
 const char SG_Port_StopBits[] = "stopBits";
 const char SG_Port_FlowControl[] = "flowControl";
 
+// data format panel keys
+const char SG_DataFormat_Format[] = "format";
+
 #endif // SETTING_DEFINES_H