diff --git a/ports/unix/main.c b/ports/unix/main.c
index aa7c92dcff..506a8ed433 100644
--- a/ports/unix/main.c
+++ b/ports/unix/main.c
@@ -421,11 +421,11 @@ STATIC void set_sys_argv(char *argv[], int argc, int start_arg) {
 #endif
 
 mp_obj_t common_hal_os_getenv_path(const char *path, const char *key, mp_obj_t default_);
-STATIC mp_obj_t get_key(mp_obj_t path_in, mp_obj_t key_to_get_in) {
+STATIC mp_obj_t getenv_from_file(mp_obj_t path_in, mp_obj_t key_to_get_in) {
     return common_hal_os_getenv_path(mp_obj_str_get_str(path_in),
-        mp_obj_str_get_str(key_to_get_in), mp_const_none);
+        mp_obj_str_get_str(key_to_get_in), default_);
 }
-MP_DEFINE_CONST_FUN_OBJ_2(get_key_obj, get_key);
+MP_DEFINE_CONST_FUN_OBJ_2(getenv_from_file_obj, get_key);
 
 MP_NOINLINE int main_(int argc, char **argv);
 
@@ -547,7 +547,7 @@ MP_NOINLINE int main_(int argc, char **argv) {
         MP_DECLARE_CONST_FUN_OBJ_0(extra_cpp_coverage_obj);
         mp_store_global(MP_QSTR_extra_coverage, MP_OBJ_FROM_PTR(&extra_coverage_obj));
         mp_store_global(MP_QSTR_extra_cpp_coverage, MP_OBJ_FROM_PTR(&extra_cpp_coverage_obj));
-        mp_store_global(MP_QSTR_get_key, MP_OBJ_FROM_PTR(&get_key_obj));
+        mp_store_global(MP_QSTR_getenv_from_file, MP_OBJ_FROM_PTR(&getenv_from_file_obj));
     }
     #endif
 
diff --git a/tests/circuitpython/environ_test.py b/tests/circuitpython/environ_test.py
index 8dfab8812c..9781444100 100644
--- a/tests/circuitpython/environ_test.py
+++ b/tests/circuitpython/environ_test.py
@@ -1,7 +1,7 @@
 import os
 
 try:
-    get_key
+    getenv_from_file
 except NameError:
     # Because run-tests.py suppresses site-packages, this test can't be run
     # on the host interpreter. However, it can be run manually to
@@ -10,7 +10,7 @@ except NameError:
     # After 3.11 becomes standard, change this to use tomllib.
     import tomlkit
 
-    def get_key(filename, key):
+    def getenv_from_file(filename, key):
         with open(filename) as f:
             s = tomlkit.load(f)
             return s.get(key, None)