--- a/testing/mozbase/mozdevice/mozdevice/adb_android.py
+++ b/testing/mozbase/mozdevice/mozdevice/adb_android.py
@@ -86,17 +86,17 @@ class ADBAndroid(ADBDevice):
         # getenforce returns either Enforcing or Permissive
 
         try:
             self.selinux = True
             if self.shell_output('getenforce', timeout=timeout) != 'Permissive':
                 self._logger.info('Setting SELinux Permissive Mode')
                 self.shell_output("setenforce Permissive", timeout=timeout, root=True)
         except (ADBError, ADBRootError), e:
-            self._logger.warning('Unable to set SELinux Permissive due to %s.', e)
+            self._logger.warning('Unable to set SELinux Permissive due to %s.' % e)
             self.selinux = False
 
         self.version = int(self.shell_output("getprop ro.build.version.sdk",
                                              timeout=timeout))
 
     def reboot(self, timeout=None):
         """Reboots the device.