diff --git a/tests/oneof.binproto b/tests/oneof.binpb
similarity index 100%
rename from tests/oneof.binproto
rename to tests/oneof.binpb
diff --git a/tests/runner_test.py b/tests/runner_test.py
index 588a1e9..86424b5 100644
--- a/tests/runner_test.py
+++ b/tests/runner_test.py
@@ -21,8 +21,8 @@
 
 def test_oneof():
     results = results_pb2.ResultSet()
-    # load the results from oneof.binproto
-    with open("tests/oneof.binproto", "rb") as f:
+    # load the results from oneof.binpb
+    with open("tests/oneof.binpb", "rb") as f:
         results.ParseFromString(f.read())
     for suite in results.suites:
         pool = descriptor_pool.Default()