diff --git a/buildman/jobutil/buildjob.py b/buildman/jobutil/buildjob.py
index 63d544790..d5514a958 100644
--- a/buildman/jobutil/buildjob.py
+++ b/buildman/jobutil/buildjob.py
@@ -62,9 +62,8 @@ class BuildJob(object):
 
     # For each cache comment, find a child image that matches the command.
     for cache_command in cache_commands:
-      print current_image.docker_image_id
-
-      current_image = model.find_child_image(repository, current_image, cache_command)
+      full_command = '["/bin/sh", "-c", "%s"]' % cache_command
+      current_image = model.find_child_image(repository, current_image, full_command)
       if current_image is None:
         return None