diff --git a/go.sum b/go.sum
index d48a71729..a5d917070 100644
--- a/go.sum
+++ b/go.sum
@@ -89,6 +89,7 @@ github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y8
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
+github.com/restic/calens v0.0.0-20190419101620-10f36cb4a529 h1:TPB3vbGNwppek0lcfpKG8rVRtvr5D78d/1MnlbfNfgA=
 github.com/restic/calens v0.0.0-20190419101620-10f36cb4a529/go.mod h1:I3AyHROuWXtWtZtI5ApjLbnN0si15sWvPQO7ul4gDow=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=