diff --git a/examples/rp2040/pico-w5500/CMakeLists.txt b/examples/rp2040/pico-w5500/CMakeLists.txt
index 707e8c92..1e246630 100644
--- a/examples/rp2040/pico-w5500/CMakeLists.txt
+++ b/examples/rp2040/pico-w5500/CMakeLists.txt
@@ -13,6 +13,4 @@ pico_enable_stdio_usb(example 1)
 pico_enable_stdio_uart(example 0)
 
 # Mongoose build flags
-add_definitions(-DMG_ARCH=MG_ARCH_NEWLIB)
 add_definitions(-DMG_ENABLE_MIP=1)
-add_definitions(-DMG_ENABLE_CUSTOM_MILLIS=1)
diff --git a/examples/rp2040/pico-w5500/main.c b/examples/rp2040/pico-w5500/main.c
index 0a12e89e..f95ab6b9 100644
--- a/examples/rp2040/pico-w5500/main.c
+++ b/examples/rp2040/pico-w5500/main.c
@@ -26,10 +26,6 @@ static uint8_t spi_txn(void *spi, uint8_t byte) {
   return result;
 }
 
-uint64_t mg_millis(void) {
-  return to_ms_since_boot(get_absolute_time());
-}
-
 static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   if (ev == MG_EV_HTTP_MSG) {
     mg_http_reply(c, 200, "", "ok\n");