diff --git a/synapse/appservice/api.py b/synapse/appservice/api.py
index 4ccb5c43c..d4cad1b1e 100644
--- a/synapse/appservice/api.py
+++ b/synapse/appservice/api.py
@@ -73,7 +73,7 @@ class ApplicationServiceApi(SimpleHttpClient):
 
     @defer.inlineCallbacks
     def query_3pu(self, service, protocol, fields):
-        uri = service.url + ("/3pu/%s" % urllib.quote(protocol))
+        uri = "%s/3pu/%s" % (service.url, urllib.quote(protocol))
         response = None
         try:
             response = yield self.get_json(uri, fields)
@@ -84,7 +84,7 @@ class ApplicationServiceApi(SimpleHttpClient):
 
     @defer.inlineCallbacks
     def query_3pl(self, service, protocol, fields):
-        uri = service.url + ("/3pl/%s" % urllib.quote(protocol))
+        uri = "%s/3pl/%s" % (service.url, urllib.quote(protocol))
         response = None
         try:
             response = yield self.get_json(uri, fields)
diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index a2715e5cf..03452f6bb 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -172,13 +172,10 @@ class ApplicationServicesHandler(object):
     def query_3pu(self, protocol, fields):
         services = yield self._get_services_for_3pn(protocol)
 
-        deferreds = []
-        for service in services:
-            deferreds.append(self.appservice_api.query_3pu(
-                service, protocol, fields
-            ))
-
-        results = yield defer.DeferredList(deferreds, consumeErrors=True)
+        results = yield defer.DeferredList([
+            self.appservice_api.query_3pu(service, protocol, fields)
+            for service in services
+        ], consumeErrors=True)
 
         ret = []
         for (success, result) in results:
@@ -199,13 +196,10 @@ class ApplicationServicesHandler(object):
     def query_3pl(self, protocol, fields):
         services = yield self._get_services_for_3pn(protocol)
 
-        deferreds = []
-        for service in services:
-            deferreds.append(self.appservice_api.query_3pl(
-                service, protocol, fields
-            ))
-
-        results = yield defer.DeferredList(deferreds, consumeErrors=True)
+        results = yield defer.DeferredList([
+            self.appservice_api.query_3pl(service, protocol, fields)
+            for service in services
+        ], consumeErrors=True)
 
         ret = []
         for (success, result) in results: