diff --git a/ports/zephyr/modusocket.c b/ports/zephyr/modusocket.c
index 8f39347e37..fbcd7e87ae 100644
--- a/ports/zephyr/modusocket.c
+++ b/ports/zephyr/modusocket.c
@@ -472,4 +472,6 @@ const mp_obj_module_t mp_module_usocket = {
     .globals = (mp_obj_dict_t *)&mp_module_usocket_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_usocket, mp_module_usocket, MICROPY_PY_USOCKET);
+
 #endif // MICROPY_PY_USOCKET
diff --git a/ports/zephyr/modutime.c b/ports/zephyr/modutime.c
index ba9e1d8f1f..c9864a4432 100644
--- a/ports/zephyr/modutime.c
+++ b/ports/zephyr/modutime.c
@@ -64,4 +64,6 @@ const mp_obj_module_t mp_module_time = {
     .globals = (mp_obj_dict_t *)&mp_module_time_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_utime, mp_module_time, MICROPY_PY_UTIME);
+
 #endif // MICROPY_PY_UTIME
diff --git a/ports/zephyr/modzephyr.c b/ports/zephyr/modzephyr.c
index 52449ea381..fc883ddc49 100644
--- a/ports/zephyr/modzephyr.c
+++ b/ports/zephyr/modzephyr.c
@@ -89,4 +89,6 @@ const mp_obj_module_t mp_module_zephyr = {
     .globals = (mp_obj_dict_t *)&mp_module_time_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_zephyr, mp_module_zephyr, MICROPY_PY_ZEPHYR);
+
 #endif // MICROPY_PY_ZEPHYR
diff --git a/ports/zephyr/modzsensor.c b/ports/zephyr/modzsensor.c
index ba7ba2e8cc..2286a46fd8 100644
--- a/ports/zephyr/modzsensor.c
+++ b/ports/zephyr/modzsensor.c
@@ -142,4 +142,6 @@ const mp_obj_module_t mp_module_zsensor = {
     .globals = (mp_obj_dict_t *)&mp_module_zsensor_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_zsensor, mp_module_zsensor, MICROPY_PY_ZSENSOR);
+
 #endif // MICROPY_PY_UHASHLIB
diff --git a/ports/zephyr/mpconfigport.h b/ports/zephyr/mpconfigport.h
index fa1cb56ae6..44231e1fc8 100644
--- a/ports/zephyr/mpconfigport.h
+++ b/ports/zephyr/mpconfigport.h
@@ -138,41 +138,6 @@ typedef long mp_off_t;
     void *machine_pin_irq_list; /* Linked list of pin irq objects */ \
     struct _mp_bluetooth_zephyr_root_pointers_t *bluetooth_zephyr_root_pointers;
 
-extern const struct _mp_obj_module_t mp_module_time;
-extern const struct _mp_obj_module_t mp_module_usocket;
-extern const struct _mp_obj_module_t mp_module_zephyr;
-extern const struct _mp_obj_module_t mp_module_zsensor;
-
-#if MICROPY_PY_USOCKET
-#define MICROPY_PY_USOCKET_DEF { MP_ROM_QSTR(MP_QSTR_usocket), MP_ROM_PTR(&mp_module_usocket) },
-#else
-#define MICROPY_PY_USOCKET_DEF
-#endif
-
-#if MICROPY_PY_UTIME
-#define MICROPY_PY_UTIME_DEF { MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&mp_module_time) },
-#else
-#define MICROPY_PY_UTIME_DEF
-#endif
-
-#if MICROPY_PY_ZEPHYR
-#define MICROPY_PY_ZEPHYR_DEF { MP_ROM_QSTR(MP_QSTR_zephyr), MP_ROM_PTR(&mp_module_zephyr) },
-#else
-#define MICROPY_PY_ZEPHYR_DEF
-#endif
-
-#if MICROPY_PY_ZSENSOR
-#define MICROPY_PY_ZSENSOR_DEF { MP_ROM_QSTR(MP_QSTR_zsensor), MP_ROM_PTR(&mp_module_zsensor) },
-#else
-#define MICROPY_PY_ZSENSOR_DEF
-#endif
-
-#define MICROPY_PORT_BUILTIN_MODULES \
-    MICROPY_PY_USOCKET_DEF \
-    MICROPY_PY_UTIME_DEF \
-    MICROPY_PY_ZEPHYR_DEF \
-    MICROPY_PY_ZSENSOR_DEF \
-
 // 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) },