diff --git a/publish_images.py b/publish_images.py
index 82d67357b0c09fa82889e32e34428f0559eb1c06..1fc002acb40668defa6fd592b87b8755a83ffa01 100755
--- a/publish_images.py
+++ b/publish_images.py
@@ -10,25 +10,26 @@ REGISTRY_URL = 'docker.km3net.de'
 
 
 def main():
-    changed_dockerfiles = [f.a_path for f in git.Repo('.').index.diff("HEAD~1")
-        if f.a_path.startswith("base/")]
+    changed_dockerfiles = [
+        f.a_path for f in git.Repo('.').index.diff("HEAD~1")
+        if f.a_path.startswith("base/")
+    ]
     n_files = len(changed_dockerfiles)
 
     if n_files == 0:
         print("Nothing to do!")
         exit(0)
 
-    print("Processing {} dockerfile{}..."
-          .format(n_files, 's' if n_files else ''))
+    print("Processing {} dockerfile{}...".format(n_files,
+                                                 's' if n_files else ''))
     for idx, fname in enumerate(changed_dockerfiles):
         progress = "({}/{})".format(idx + 1, n_files)
 
         steps = [("Building",
-                    "docker build --pull -t {0}/{1} -f {1} . "
-                    .format(REGISTRY_URL, fname)),
-                 ("Pushing",
-                    "docker push {0}/{1}"
-                    .format(REGISTRY_URL, fname))]
+                  "docker build --pull -t {0}/{1} -f {1} . ".format(
+                      REGISTRY_URL, fname)),
+                 ("Pushing", "docker push {0}/{1}".format(REGISTRY_URL,
+                                                          fname))]
 
         print('-' * 79)