diff --git a/tests/lib/test_repo_tool.py b/tests/lib/test_repo_tool.py
index 15baabe..27dfb67 100644
--- a/tests/lib/test_repo_tool.py
+++ b/tests/lib/test_repo_tool.py
@@ -154,7 +154,12 @@ def test_fetch_ok(tmp_path):
 	repo_a.joinpath(".gitignore").touch()
 	# commit it
 	r.git.add(".gitignore")
-	r.git.commit(message = "Test Commit", author = "Tester <test@a.b>")
+	with r.config_writer("repository") as cw:
+		cw.add_section("user")
+		cw.add_value("user", "name", "Tester")
+		cw.add_value("user", "email", "test@a.b")
+
+	r.git.commit(message = "Test Commit")
 	hash = r.commit("master").hexsha
 
 	assert rt.fetch()