diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h
index c931b91f4c..04ea8f9576 100644
--- a/py/circuitpy_mpconfig.h
+++ b/py/circuitpy_mpconfig.h
@@ -460,12 +460,26 @@ extern const struct _mp_obj_module_t ustack_module;
 #define USTACK_MODULE
 #endif
 
+// These modules are not yet in shared-bindings, but we prefer the non-uxxx names.
+#if MICROPY_PY_UERRNO
+#define ERRNO_MODULE
+    { MP_ROM_QSTR(MP_QSTR_errno), MP_ROM_PTR(&mp_module_uerrno) },
+#else
+#define ERRNO_MODULE
+#endif
+
 #if MICROPY_PY_UJSON
 #define JSON_MODULE { MP_ROM_QSTR(MP_QSTR_json), MP_ROM_PTR(&mp_module_ujson) },
 #else
 #define JSON_MODULE
 #endif
 
+#if MICROPY_PY_URE
+#define RE_MODULE { MP_ROM_QSTR(MP_QSTR_re), MP_ROM_PTR(&mp_module_ure) },
+#else
+#define RE_MODULE
+#endif
+
 // Define certain native modules with weak links so they can be replaced with Python
 // implementations. This list may grow over time.
 #define MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS \
@@ -495,6 +509,7 @@ extern const struct _mp_obj_module_t ustack_module;
     DIGITALIO_MODULE \
       TERMINALIO_MODULE \
     DISPLAYIO_MODULE \
+    ERRNO_MODULE \
     GAMEPAD_MODULE \
     I2CSLAVE_MODULE \
     JSON_MODULE \
@@ -507,6 +522,7 @@ extern const struct _mp_obj_module_t ustack_module;
     PIXELBUF_MODULE \
     PULSEIO_MODULE \
     RANDOM_MODULE \
+    RE_MODULE \
     RTC_MODULE \
     SAMD_MODULE \
     STAGE_MODULE \
diff --git a/py/objmodule.c b/py/objmodule.c
index 05ec26e481..4ac94311ef 100644
--- a/py/objmodule.c
+++ b/py/objmodule.c
@@ -179,7 +179,6 @@ STATIC const mp_rom_map_elem_t mp_builtin_module_table[] = {
     // extmod modules
 
 #if MICROPY_PY_UERRNO
-    { MP_ROM_QSTR(MP_QSTR_errno), MP_ROM_PTR(&mp_module_uerrno) },
     { MP_ROM_QSTR(MP_QSTR_uerrno), MP_ROM_PTR(&mp_module_uerrno) },
 #endif
 #if MICROPY_PY_UCTYPES
@@ -189,11 +188,9 @@ STATIC const mp_rom_map_elem_t mp_builtin_module_table[] = {
     { MP_ROM_QSTR(MP_QSTR_uzlib), MP_ROM_PTR(&mp_module_uzlib) },
 #endif
 #if MICROPY_PY_UJSON
-    { MP_ROM_QSTR(MP_QSTR_json), MP_ROM_PTR(&mp_module_ujson) },
     { MP_ROM_QSTR(MP_QSTR_ujson), MP_ROM_PTR(&mp_module_ujson) },
 #endif
 #if MICROPY_PY_URE
-    { MP_ROM_QSTR(MP_QSTR_re), MP_ROM_PTR(&mp_module_ure) },
     { MP_ROM_QSTR(MP_QSTR_ure), MP_ROM_PTR(&mp_module_ure) },
 #endif
 #if MICROPY_PY_UHEAPQ