diff --git a/tests/tools/test_docker_environment.py b/tests/tools/test_docker_environment.py
index 04935d81dfc..cea9ae4e4ff 100644
--- a/tests/tools/test_docker_environment.py
+++ b/tests/tools/test_docker_environment.py
@@ -109,6 +109,7 @@ def test_ensure_docker_available_uses_resolved_executable(monkeypatch):
             "capture_output": True,
             "text": True,
             "timeout": 5,
+            "stdin": subprocess.DEVNULL,
         })
     ]