diff --git a/inventory_provider/routes/poller.py b/inventory_provider/routes/poller.py
index 6c95ad6898533b23f57b90450a1b8609cb926daf..a27bde39b398c2961cc37233474852f67a39e572 100644
--- a/inventory_provider/routes/poller.py
+++ b/inventory_provider/routes/poller.py
@@ -115,7 +115,6 @@ MULTICAST_SUBSCRIPTION_LIST_SCHEMA = {
 }
 
 
-
 @routes.after_request
 def after_request(resp):
     return common.after_request(resp)
@@ -445,7 +444,7 @@ def eumetsat_multicast(hostname=None):
     MX1_FRA = 'mx1.fra.de.geant.net'
     SUBSCRIPTIONS = [{
             'subscription': f'232.223.223.{idx}',
-            'endpoint':'193.17.9.3',
+            'endpoint': '193.17.9.3',
         } for idx in range(1, 73)]
 
     SUBSCRIPTIONS.append(
@@ -458,8 +457,7 @@ def eumetsat_multicast(hostname=None):
                 f'.{sub["subscription"]}.{sub["endpoint"]}'
                 '.255.255.255.255')
 
-
-    cache_key = f'classifier-cache:poller-eumetsat-multicast'
+    cache_key = 'classifier-cache:poller-eumetsat-multicast'
 
     r = common.get_current_redis()
 
diff --git a/test/test_general_poller_routes.py b/test/test_general_poller_routes.py
index 3131028238b29cb943d60a7ae82a0e942b7986e2..756446610cfcf062031dab534a0a84900ddb8563 100644
--- a/test/test_general_poller_routes.py
+++ b/test/test_general_poller_routes.py
@@ -23,7 +23,7 @@ def test_get_all_interfaces(client):
 
 def test_all_router_interface_speeds(client):
     rv = client.post(
-        f'/poller/speeds',
+        '/poller/speeds',
         headers=DEFAULT_REQUEST_HEADERS)
 
     assert rv.status_code == 200