diff --git a/common/config.h b/common/config.h
index 6f7798b..4e0de52 100644
--- a/common/config.h
+++ b/common/config.h
@@ -29,9 +29,6 @@
 // no auto repeat stuff
 #define QUICK_TAP_TERM 0
 
-// master has the USB and is the left one
-#define MASTER_LEFT
-
 // tranfer enough info for the stuff we render on the OLEDs
 #define SPLIT_LAYER_STATE_ENABLE
 #define SPLIT_LED_STATE_ENABLE
diff --git a/keyboards/crkbd/keymaps/christoph-cullmann/config.h b/keyboards/crkbd/keymaps/christoph-cullmann/config.h
index ae8e70b..d4d52a1 100644
--- a/keyboards/crkbd/keymaps/christoph-cullmann/config.h
+++ b/keyboards/crkbd/keymaps/christoph-cullmann/config.h
@@ -7,3 +7,6 @@
 
 // our shared config parts
 #include "common/config.h"
+
+// select hand configuration
+#define SPLIT_USB_DETECT