diff --git a/oslo_messaging/_drivers/protocols/amqp/driver.py b/oslo_messaging/_drivers/protocols/amqp/driver.py
index cf1c9127b..e5a1bd4e9 100644
--- a/oslo_messaging/_drivers/protocols/amqp/driver.py
+++ b/oslo_messaging/_drivers/protocols/amqp/driver.py
@@ -180,7 +180,7 @@ class ProtonDriver(base.BaseDriver):
         """Send a message to the given target."""
         # TODO(kgiusti) need to add support for retry
         if retry is not None:
-            raise NotImplementedError('"retry" not implemented by'
+            raise NotImplementedError('"retry" not implemented by '
                                       'this transport driver')
 
         request = marshal_request(message, ctxt, envelope)
@@ -210,7 +210,7 @@ class ProtonDriver(base.BaseDriver):
         """Send a notification message to the given target."""
         # TODO(kgiusti) need to add support for retry
         if retry is not None:
-            raise NotImplementedError('"retry" not implemented by'
+            raise NotImplementedError('"retry" not implemented by '
                                       'this transport driver')
         return self.send(target, ctxt, message, envelope=(version == 2.0))
 
@@ -226,7 +226,7 @@ class ProtonDriver(base.BaseDriver):
     def listen_for_notifications(self, targets_and_priorities, pool):
         LOG.debug("Listen for notifications %s", targets_and_priorities)
         if pool:
-            raise NotImplementedError('"pool" not implemented by'
+            raise NotImplementedError('"pool" not implemented by '
                                       'this transport driver')
         listener = ProtonListener(self)
         for target, priority in targets_and_priorities:
diff --git a/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_publisher_base.py b/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_publisher_base.py
index 6daf6db18..e2f898550 100644
--- a/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_publisher_base.py
+++ b/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_publisher_base.py
@@ -90,7 +90,7 @@ class PublisherBase(object):
         :param request: Message data and destination container object
         :type request: zmq_request.Request
         """
-        LOG.debug("Sending %(type)s message_id %(message)s to a target"
+        LOG.debug("Sending %(type)s message_id %(message)s to a target "
                   "%(target)s"
                   % {"type": request.msg_type,
                      "message": request.message_id,