diff --git a/ports/powerpc/main.c b/ports/powerpc/main.c
index fa69696394..2c24ce87a3 100644
--- a/ports/powerpc/main.c
+++ b/ports/powerpc/main.c
@@ -115,11 +115,6 @@ mp_import_stat_t mp_import_stat(const char *path) {
     return MP_IMPORT_STAT_NO_EXIST;
 }
 
-mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
-    return mp_const_none;
-}
-MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
-
 void nlr_jump_fail(void *val) {
     while (1) {
         ;
diff --git a/ports/powerpc/mpconfigport.h b/ports/powerpc/mpconfigport.h
index bc46c8db55..67e92c5358 100644
--- a/ports/powerpc/mpconfigport.h
+++ b/ports/powerpc/mpconfigport.h
@@ -94,10 +94,6 @@
 
 typedef long mp_off_t;
 
-// extra built in names to add to the global namespace
-#define MICROPY_PORT_BUILTINS \
-    { MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mp_builtin_open_obj) },
-
 #define MICROPY_HW_BOARD_NAME "bare-metal"
 #define MICROPY_HW_MCU_NAME "POWERPC"