diff --git a/synapse/metrics/resource.py b/synapse/metrics/resource.py
index 97ea797bf..0af4b3eb5 100644
--- a/synapse/metrics/resource.py
+++ b/synapse/metrics/resource.py
@@ -14,7 +14,6 @@
 # limitations under the License.
 
 from twisted.web.resource import Resource
-from twisted.web.server import NOT_DONE_YET
 
 import synapse.metrics