diff --git a/tests/go.mod b/tests/go.mod
index b492c3e28..37259f85e 100644
--- a/tests/go.mod
+++ b/tests/go.mod
@@ -11,6 +11,7 @@ require (
 	github.com/etcd-io/gofail v0.0.0-20190801230047-ad7f989257ca
 	github.com/gogo/protobuf v1.2.1
 	github.com/golang/protobuf v1.3.2
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/grpc-ecosystem/grpc-gateway v1.9.5
 	github.com/prometheus/client_golang v1.0.0
 	github.com/soheilhy/cmux v0.1.4