diff --git a/esp8266/main.c b/esp8266/main.c
index c938dcb30b..033ab7afed 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -141,7 +141,7 @@ mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
 
-void nlr_jump_fail(void *val) {
+void MP_FASTCODE(nlr_jump_fail)(void *val) {
     printf("NLR jump failed\n");
     for (;;) {
     }