diff --git a/ci/pipeline/determine_tests_to_run.py b/ci/pipeline/determine_tests_to_run.py
index fef96188b..2b3e0dee3 100644
--- a/ci/pipeline/determine_tests_to_run.py
+++ b/ci/pipeline/determine_tests_to_run.py
@@ -54,9 +54,9 @@ def get_commit_range():
         with open(os.environ["GITHUB_EVENT_PATH"], "rb") as f:
             event = json.loads(f.read())
         base = event["pull_request"]["base"]["sha"]
-        commit_range = "{}...{}".format(base, event.get("after", ""))
+        commit_range = "{}..{}".format(base, event.get("after", ""))
     elif os.environ.get("BUILDKITE"):
-        commit_range = "origin/{}...{}".format(
+        commit_range = "origin/{}..{}".format(
             os.environ["BUILDKITE_PULL_REQUEST_BASE_BRANCH"],
             os.environ["BUILDKITE_COMMIT"],
         )