diff --git a/ports/teensy/modpyb.c b/ports/teensy/modpyb.c
index f5bb3ea7b8..b8fcfaaa5d 100644
--- a/ports/teensy/modpyb.c
+++ b/ports/teensy/modpyb.c
@@ -360,3 +360,5 @@ const mp_obj_module_t pyb_module = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t *)&pyb_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_pyb, pyb_module, 1);
diff --git a/ports/teensy/mpconfigport.h b/ports/teensy/mpconfigport.h
index 3acedcf024..0ee83ba400 100644
--- a/ports/teensy/mpconfigport.h
+++ b/ports/teensy/mpconfigport.h
@@ -34,14 +34,8 @@
 // extra built in names to add to the global namespace
 #define MICROPY_PORT_BUILTINS \
 
-// extra built in modules to add to the list of known ones
-extern const struct _mp_obj_module_t os_module;
-extern const struct _mp_obj_module_t pyb_module;
-extern const struct _mp_obj_module_t time_module;
-#define MICROPY_PORT_BUILTIN_MODULES \
-    { MP_ROM_QSTR(MP_QSTR_pyb), MP_ROM_PTR(&pyb_module) }, \
-
 // extra constants
+extern const struct _mp_obj_module_t pyb_module;
 #define MICROPY_PORT_CONSTANTS \
     { MP_ROM_QSTR(MP_QSTR_pyb), MP_ROM_PTR(&pyb_module) }, \