diff --git a/workers/dockerfilebuild.py b/workers/dockerfilebuild.py
index d200a336e..8442237bd 100644
--- a/workers/dockerfilebuild.py
+++ b/workers/dockerfilebuild.py
@@ -224,7 +224,7 @@ class DockerfileBuildContext(object):
       logger.debug('Logging in with pull credentials: %s@%s',
                    self._pull_credentials['username'], self._pull_credentials['registry'])
       
-      self._build_logger('Pulling base image: %s' % image_and_tag, {
+      self._build_logger('Pulling base image: %s' % image_and_tag, log_data = {
         'phasestep': 'login',
         'username': self._pull_credentials['username'],
         'registry': self._pull_credentials['registry']
@@ -241,7 +241,7 @@ class DockerfileBuildContext(object):
 
     image_and_tag = ':'.join(image_and_tag_tuple)
 
-    self._build_logger('Pulling base image: %s' % image_and_tag, {
+    self._build_logger('Pulling base image: %s' % image_and_tag, log_data = {
       'phasestep': 'pull',
       'repo_url': image_and_tag
     })