diff --git a/module_usb_aud_shared/devicedefines.h b/module_usb_aud_shared/devicedefines.h
index 7b01659c..2df37615 100644
--- a/module_usb_aud_shared/devicedefines.h
+++ b/module_usb_aud_shared/devicedefines.h
@@ -404,7 +404,6 @@
 
 #define DFU_VENDOR_ID               VENDOR_ID
 #define DFU_BCD_DEVICE              BCD_DEVICE
-#define DFU_SERIAL_STR_INDEX        SERIAL_STR_INDEX
 #define DFU_MANUFACTURER_INDEX      MANUFACTURER_STR_INDEX
 #define DFU_PRODUCT_INDEX           PRODUCT_STR_INDEX
 #endif