diff --git a/etcdmain/etcd.go b/etcdmain/etcd.go
index a38bb0be6..321e1ce47 100644
--- a/etcdmain/etcd.go
+++ b/etcdmain/etcd.go
@@ -382,6 +382,7 @@ func setupLogging(cfg *config) {
 	capnslog.SetGlobalLogLevel(capnslog.INFO)
 	if cfg.Debug {
 		capnslog.SetGlobalLogLevel(capnslog.DEBUG)
+		grpc.EnableTracing = true
 	}
 	if cfg.LogPkgLevels != "" {
 		repoLog := capnslog.MustRepoLogger("github.com/coreos/etcd")