diff --git a/examples/device/board_test/src/tusb_config.h b/examples/device/board_test/src/tusb_config.h
index 2f2a4deeb..1a52cc348 100644
--- a/examples/device/board_test/src/tusb_config.h
+++ b/examples/device/board_test/src/tusb_config.h
@@ -64,7 +64,9 @@
 // DEVICE CONFIGURATION
 //--------------------------------------------------------------------
 
+#ifndef CFG_TUD_ENDPOINT0_SIZE
 #define CFG_TUD_ENDPOINT0_SIZE   64
+#endif
 
 //------------- CLASS -------------//
 #define CFG_TUD_CDC             0
diff --git a/examples/device/usbtmc/src/tusb_config.h b/examples/device/usbtmc/src/tusb_config.h
index 9141e6a5a..124680ca2 100644
--- a/examples/device/usbtmc/src/tusb_config.h
+++ b/examples/device/usbtmc/src/tusb_config.h
@@ -51,7 +51,9 @@
 // DEVICE CONFIGURATION
 //--------------------------------------------------------------------
 
+#ifndef CFG_TUD_ENDPOINT0_SIZE
 #define CFG_TUD_ENDPOINT0_SIZE    64
+#endif
 
 //------------- CLASS -------------//