diff --git a/examples/device/dfu_rt/src/tusb_config.h b/examples/device/dfu_rt/src/tusb_config.h
index b4f7a5562..7e79995d9 100644
--- a/examples/device/dfu_rt/src/tusb_config.h
+++ b/examples/device/dfu_rt/src/tusb_config.h
@@ -51,7 +51,9 @@
 // DEVICE CONFIGURATION
 //--------------------------------------------------------------------
 
+#ifndef CFG_TUD_ENDPOINT0_SIZE
 #define CFG_TUD_ENDPOINT0_SIZE    64
+#endif
 
 //------------- CLASS -------------//