diff --git a/neutron/plugins/midonet/midonet_lib.py b/neutron/plugins/midonet/midonet_lib.py
index a9133900e9..5989f982af 100644
--- a/neutron/plugins/midonet/midonet_lib.py
+++ b/neutron/plugins/midonet/midonet_lib.py
@@ -274,8 +274,8 @@ class MidoClient:
         :returns: newly created router
         """
         LOG.debug(_("MidoClient.create_tenant_router called: "
-                    "tenant_id=%(tenant_id)s, name=%(name)s"
-                    "metadata_router=%(metadata_router)s"),
+                    "tenant_id=%(tenant_id)s, name=%(name)s,"
+                    " metadata_router=%(metadata_router)s"),
                   {'tenant_id': tenant_id, 'name': name,
                    'metadata_router': metadata_router})
         router = self.create_router(tenant_id, name)
diff --git a/neutron/plugins/nicira/extensions/nvp_qos.py b/neutron/plugins/nicira/extensions/nvp_qos.py
index ade87a5ac7..27aea5e51a 100644
--- a/neutron/plugins/nicira/extensions/nvp_qos.py
+++ b/neutron/plugins/nicira/extensions/nvp_qos.py
@@ -44,7 +44,7 @@ class DefaultQueueAlreadyExists(qexception.InUse):
 
 class QueueInvalidDscp(qexception.InvalidInput):
     message = _("Invalid value for dscp %(data)s must be integer value"
-                "between 0 and 63.")
+                " between 0 and 63.")
 
 
 class QueueMinGreaterMax(qexception.InvalidInput):
diff --git a/neutron/plugins/nicira/nvplib.py b/neutron/plugins/nicira/nvplib.py
index 7d35d2c971..47a500170d 100644
--- a/neutron/plugins/nicira/nvplib.py
+++ b/neutron/plugins/nicira/nvplib.py
@@ -503,8 +503,8 @@ def update_explicit_routes_lrouter(cluster, router_id, routes):
                 added_routes.append(uuid)
     except NvpApiClient.NvpApiException:
         LOG.exception(_('Cannot update NVP routes %(routes)s for'
-                      'router %(router_id)s') % {'routes': routes,
-                                                 'router_id': router_id})
+                        ' router %(router_id)s') % {'routes': routes,
+                                                    'router_id': router_id})
         # Roll back to keep NVP in consistent state
         with excutils.save_and_reraise_exception():
             if nvp_routes:
@@ -746,7 +746,7 @@ def create_lport(cluster, lswitch_uuid, tenant_id, neutron_port_id,
     result = do_request(HTTP_POST, path, json.dumps(lport_obj),
                         cluster=cluster)
 
-    LOG.debug(_("Created logical port %(result)s on logical swtich %(uuid)s"),
+    LOG.debug(_("Created logical port %(result)s on logical switch %(uuid)s"),
               {'result': result['uuid'], 'uuid': lswitch_uuid})
     return result
 
diff --git a/neutron/policy.py b/neutron/policy.py
index f22894de16..2d25a8d775 100644
--- a/neutron/policy.py
+++ b/neutron/policy.py
@@ -214,7 +214,7 @@ class OwnerCheck(policy.Check):
                                            match)[0]
         except IndexError:
             err_reason = (_("Unable to identify a target field from:%s."
-                            "match should be in the form %%(<field_name>)s"),
+                            "match should be in the form %%(<field_name>)s") %
                           match)
             LOG.exception(err_reason)
             raise exceptions.PolicyInitError(