diff --git a/src/hasp_config.h b/src/hasp_config.h
index 0cf1fc33..cadfc462 100644
--- a/src/hasp_config.h
+++ b/src/hasp_config.h
@@ -19,6 +19,7 @@ const char F_CONFIG_GROUP[] PROGMEM     = "group";
 const char F_GUI_TICKPERIOD[] PROGMEM   = "tickperiod";
 const char F_GUI_IDLEPERIOD[] PROGMEM   = "idle";
 const char F_GUI_CALIBRATION[] PROGMEM  = "calibration";
+const char F_GUI_BACKLIGHTPIN[] PROGMEM = "bcklpin";
 
 void configSetup(JsonDocument & settings);
 void configLoop(void);