diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index e4c8fe29..5e28695c 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -834,8 +834,8 @@
 #define DFU_PID                     PID_AUDIO_2
 #define DFU_VENDOR_ID               VENDOR_ID
 #define DFU_BCD_DEVICE              BCD_DEVICE
-#define DFU_MANUFACTURER_STR_INDEX  MANUFACTURER_STR_INDEX
-#define DFU_PRODUCT_STR_INDEX       PRODUCT_STR_INDEX_A2
+#define DFU_MANUFACTURER_STR_INDEX  offsetof(StringDescTable_t, vendorStr)/sizeof(char *)  
+#define DFU_PRODUCT_STR_INDEX       offsetof(StringDescTable_t, productStr_Audio2)/sizeof(char *) 
 #endif
 
 /* USB test mode support enabled by default (Required for compliance testing) */