diff --git a/examples/device/net_lwip_webserver/src/tusb_config.h b/examples/device/net_lwip_webserver/src/tusb_config.h
index fe72ecdfe..025c0b0bf 100644
--- a/examples/device/net_lwip_webserver/src/tusb_config.h
+++ b/examples/device/net_lwip_webserver/src/tusb_config.h
@@ -82,6 +82,16 @@
 #define CFG_TUSB_MEM_ALIGN        __attribute__ ((aligned(4)))
 #endif
 
+// number of NCM transfer blocks for reception side (only valid if NCM is selected below)
+#ifndef CFG_TUD_NCM_OUT_NTB_N
+#define CFG_TUD_NCM_OUT_NTB_N     2
+#endif
+
+// number of NCM transfer blocks for transmission side (only valid if NCM is selected below)
+#ifndef CFG_TUD_NCM_IN_NTB_N
+#define CFG_TUD_NCM_IN_NTB_N      3
+#endif
+
 //--------------------------------------------------------------------
 // DEVICE CONFIGURATION
 //--------------------------------------------------------------------
@@ -94,8 +104,8 @@
 
 // Network class has 2 drivers: ECM/RNDIS and NCM.
 // Only one of the drivers can be enabled
-#define CFG_TUD_ECM_RNDIS     1
-#define CFG_TUD_NCM           (1-CFG_TUD_ECM_RNDIS)
+#define CFG_TUD_ECM_RNDIS         0
+#define CFG_TUD_NCM               (1-CFG_TUD_ECM_RNDIS)
 
 #ifdef __cplusplus
  }