diff --git a/go.mod b/go.mod
index f7f888c9..8313731e 100644
--- a/go.mod
+++ b/go.mod
@@ -26,6 +26,7 @@ require (
 	github.com/docker/go v1.5.1-1.0.20160303222718-d30aec9fd63c // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-metrics v0.0.0-20170502235133-d466d4f6fd96 // indirect
+	github.com/docker/go-units v0.3.1
 	github.com/docker/libtrust v0.0.0-20150526203908-9cbd2a1374f4 // indirect
 	github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 // indirect
 	github.com/ghodss/yaml v1.0.0 // indirect