diff --git a/examples/device/net_lwip_webserver/src/main.c b/examples/device/net_lwip_webserver/src/main.c
index 88081ffe2..19a0eae9d 100644
--- a/examples/device/net_lwip_webserver/src/main.c
+++ b/examples/device/net_lwip_webserver/src/main.c
@@ -64,7 +64,7 @@ static struct pbuf *received_frame;
 /* this is used by this code, ./class/net/net_driver.c, and usb_descriptors.c */
 /* ideally speaking, this should be generated from the hardware's unique ID (if available) */
 /* it is suggested that the first byte is 0x02 to indicate a link-local address */
-const uint8_t tud_network_mac_address[6] = {0x02,0x02,0x84,0x6A,0x96,0x00};
+uint8_t tud_network_mac_address[6] = {0x02,0x02,0x84,0x6A,0x96,0x00};
 
 /* network parameters of this MCU */
 static const ip4_addr_t ipaddr  = INIT_IP4(192, 168, 7, 1);
diff --git a/src/class/net/net_device.h b/src/class/net/net_device.h
index 133689deb..399916355 100644
--- a/src/class/net/net_device.h
+++ b/src/class/net/net_device.h
@@ -94,7 +94,7 @@ void tud_network_init_cb(void);
 
 // client must provide this: 48-bit MAC address
 // TODO removed later since it is not part of tinyusb stack
-extern const uint8_t tud_network_mac_address[6];
+extern uint8_t tud_network_mac_address[6];
 
 //------------- NCM -------------//
 
diff --git a/test/fuzz/net_fuzz.cc b/test/fuzz/net_fuzz.cc
index 3158e74ef..63cd1ac98 100644
--- a/test/fuzz/net_fuzz.cc
+++ b/test/fuzz/net_fuzz.cc
@@ -67,7 +67,7 @@ void tud_network_init_cb(void) {
 
 // client must provide this: 48-bit MAC address
 // TODO removed later since it is not part of tinyusb stack
-const uint8_t tud_network_mac_address[6] = {0};
+uint8_t tud_network_mac_address[6] = {0};
 
 //------------- NCM -------------//