diff --git a/src/core/settings/plugins/keyfile/nms-keyfile-writer.c b/src/core/settings/plugins/keyfile/nms-keyfile-writer.c
index ad6f277ce3..12e6993fa2 100644
--- a/src/core/settings/plugins/keyfile/nms-keyfile-writer.c
+++ b/src/core/settings/plugins/keyfile/nms-keyfile-writer.c
@@ -458,14 +458,14 @@ nms_keyfile_writer_connection(NMConnection                   *connection,
 }
 
 gboolean
-nms_keyfile_writer_test_connection(NMConnection  *connection,
-                                   const char    *keyfile_dir,
-                                   uid_t          owner_uid,
-                                   pid_t          owner_grp,
-                                   char         **out_path,
-                                   NMConnection **out_reread,
-                                   gboolean      *out_reread_same,
-                                   GError       **error)
+nmtst_keyfile_writer_test_connection(NMConnection  *connection,
+                                     const char    *keyfile_dir,
+                                     uid_t          owner_uid,
+                                     pid_t          owner_grp,
+                                     char         **out_path,
+                                     NMConnection **out_reread,
+                                     gboolean      *out_reread_same,
+                                     GError       **error)
 {
     return _internal_write_connection(connection,
                                       FALSE,
diff --git a/src/core/settings/plugins/keyfile/nms-keyfile-writer.h b/src/core/settings/plugins/keyfile/nms-keyfile-writer.h
index 62aaa19da7..cb7050a4d9 100644
--- a/src/core/settings/plugins/keyfile/nms-keyfile-writer.h
+++ b/src/core/settings/plugins/keyfile/nms-keyfile-writer.h
@@ -30,13 +30,13 @@ gboolean nms_keyfile_writer_connection(NMConnection                   *connectio
                                        gboolean                       *out_reread_same,
                                        GError                        **error);
 
-gboolean nms_keyfile_writer_test_connection(NMConnection  *connection,
-                                            const char    *keyfile_dir,
-                                            uid_t          owner_uid,
-                                            pid_t          owner_grp,
-                                            char         **out_path,
-                                            NMConnection **out_reread,
-                                            gboolean      *out_reread_same,
-                                            GError       **error);
+gboolean nmtst_keyfile_writer_test_connection(NMConnection  *connection,
+                                              const char    *keyfile_dir,
+                                              uid_t          owner_uid,
+                                              pid_t          owner_grp,
+                                              char         **out_path,
+                                              NMConnection **out_reread,
+                                              gboolean      *out_reread_same,
+                                              GError       **error);
 
 #endif /* __NMS_KEYFILE_WRITER_H__ */
diff --git a/src/core/settings/plugins/keyfile/tests/test-keyfile-settings.c b/src/core/settings/plugins/keyfile/tests/test-keyfile-settings.c
index 83019babb1..866b1ffd34 100644
--- a/src/core/settings/plugins/keyfile/tests/test-keyfile-settings.c
+++ b/src/core/settings/plugins/keyfile/tests/test-keyfile-settings.c
@@ -138,14 +138,14 @@ write_test_connection_reread(NMConnection  *connection,
 
     connection_normalized = nmtst_connection_duplicate_and_normalize(connection);
 
-    success = nms_keyfile_writer_test_connection(connection_normalized,
-                                                 TEST_SCRATCH_DIR,
-                                                 owner_uid,
-                                                 owner_grp,
-                                                 testfile,
-                                                 out_reread,
-                                                 out_reread_same,
-                                                 p_error);
+    success = nmtst_keyfile_writer_test_connection(connection_normalized,
+                                                   TEST_SCRATCH_DIR,
+                                                   owner_uid,
+                                                   owner_grp,
+                                                   testfile,
+                                                   out_reread,
+                                                   out_reread_same,
+                                                   p_error);
     g_assert_no_error(error);
     g_assert(success);
     g_assert(*testfile && (*testfile)[0]);