diff --git a/fence/metrics.py b/fence/metrics.py
index 813df2915..5598428b8 100644
--- a/fence/metrics.py
+++ b/fence/metrics.py
@@ -7,6 +7,7 @@
     Counter,
     Gauge,
 )
+from werkzeug.middleware.dispatcher import DispatcherMiddleware
 
 PROMETHEUS_TMP_COUNTER_DIR = tempfile.TemporaryDirectory()