diff --git a/module_usb_aud_shared/devicedefines.h b/module_usb_aud_shared/devicedefines.h
index bac09997..8bc28adf 100644
--- a/module_usb_aud_shared/devicedefines.h
+++ b/module_usb_aud_shared/devicedefines.h
@@ -9,6 +9,10 @@
 
 #include "customdefines.h"
 
+#if defined(IO_EXPANSION) && (IO_EXPANSION == 0)
+#undef IO_EXPANSION
+#endif
+
 #if defined(IAP) && (IAP == 0)
 #undef IAP
 #endif