diff --git a/oslo/vmware/common/loopingcall.py b/oslo/vmware/common/loopingcall.py
index 3b95e44d..a22309af 100644
--- a/oslo/vmware/common/loopingcall.py
+++ b/oslo/vmware/common/loopingcall.py
@@ -79,7 +79,7 @@ class FixedIntervalLoopingCall(LoopingCallBase):
                         break
                     delay = interval - timeutils.delta_seconds(start, end)
                     if delay <= 0:
-                        LOG.warn(_('task run outlasted interval by %s sec') %
+                        LOG.warn(_('task run outlasted interval by %s sec'),
                                  -delay)
                     greenthread.sleep(delay if delay > 0 else 0)
             except LoopingCallDone as e:
diff --git a/oslo/vmware/exceptions.py b/oslo/vmware/exceptions.py
index 875bd220..f9791492 100644
--- a/oslo/vmware/exceptions.py
+++ b/oslo/vmware/exceptions.py
@@ -118,7 +118,8 @@ class VMwareDriverException(Exception):
                 # log the issue and the kwargs
                 LOG.exception(_('Exception in string format operation'))
                 for name, value in six.iteritems(kwargs):
-                    LOG.error("%s: %s" % (name, value))
+                    LOG.error("%(name)s: %(value)s",
+                              {'name': name, 'value': value})
                 # at least get the core message out if something happened
                 message = self.msg_fmt