diff --git a/vpe-router/lib/charms/router.py b/vpe-router/lib/charms/router.py
index 32afcba..54ff7fb 100644
--- a/vpe-router/lib/charms/router.py
+++ b/vpe-router/lib/charms/router.py
@@ -54,10 +54,9 @@
     stdout, stderr = p.communicate()
     retcode = p.poll()
     if retcode > 0:
-        raise subprocess.CalledProcessError(
-            returncode=retcode,
-            cmd=cmd,
-            output=stderr.decode("utf-8").strip())
+        raise subprocess.CalledProcessError(returncode=retcode,
+                                            cmd=cmd,
+                                            output=stderr.decode("utf-8").strip())
     return (''.join(stdout), ''.join(stderr))