diff --git a/build/toolchain.emscripten.mak b/build/toolchain.emscripten.mak
index 313209791..b6ff28cbf 100644
--- a/build/toolchain.emscripten.mak
+++ b/build/toolchain.emscripten.mak
@@ -59,7 +59,6 @@ __ZThn36_N4Code17ConsoleController9inputTextEPKc \
 __ZZN4Code14MenuControllerC1EP9ResponderPNS_11ScriptStoreEP19ButtonRowControllerbEN3__08__invokeEPvS8_ \
 __ZZN4Code14MenuControllerC1EP9ResponderPNS_11ScriptStoreEP19ButtonRowControllerbENK3__0clEPvS8_ \
 _delay_ms \
-_delay_us \
 _do_load \
 _do_load_from_lexer \
 _fun_bc_call \
diff --git a/python/port/modtime.c b/python/port/modtime.c
index 2a3756e07..5806c3a61 100644
--- a/python/port/modtime.c
+++ b/python/port/modtime.c
@@ -6,7 +6,7 @@
 
 #include "ion/timing.h"
 
-void delay_ms(mp_uint_t delay) {
+static void delay_ms(mp_uint_t delay) {
   uint32_t start = millis();
   while (millis() - start < delay && !micropython_port_should_interrupt()) {
     msleep(1);