diff --git a/tests/config/test_cache.py b/tests/config/test_cache.py
index 3b3a49c779..94370265f1 100644
--- a/tests/config/test_cache.py
+++ b/tests/config/test_cache.py
@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
-
 from synapse.config._base import Config, RootConfig
 from synapse.config.cache import CacheConfig