diff --git a/src/obk_config.h b/src/obk_config.h
index 9ad622ad8..9db6e5949 100644
--- a/src/obk_config.h
+++ b/src/obk_config.h
@@ -78,6 +78,8 @@
 #define ENABLE_DRIVER_WEMO		1
 #define ENABLE_DRIVER_FREEZE	0
 #define ENABLE_DRIVER_DHT		1
+// parse things like $CH1 or $hour etc
+#define ENABLE_EXPAND_CONSTANT	1
 
 #elif PLATFORM_BEKEN