diff --git a/experimental/build_on_circle.sh b/experimental/build_on_circle.sh
index d372e51ee3..fff932eda5 100755
--- a/experimental/build_on_circle.sh
+++ b/experimental/build_on_circle.sh
@@ -2,4 +2,4 @@
 
 set -e
 
-./in_parallel.sh "make RM=" $(find . -maxdepth 2 -name *.go -printf "%h\n" | sort -u | sed -n 's/\.\/\(.*\)/\1\/\1/p')
+./in_parallel.sh "make RM=" tracer $(find . -maxdepth 2 -name *.go -printf "%h\n" | sort -u | sed -n 's/\.\/\(.*\)/\1\/\1/p')
diff --git a/experimental/tracer/main/main.go b/experimental/tracer/main/main.go
index eb474ea4a2..29408bd00c 100644
--- a/experimental/tracer/main/main.go
+++ b/experimental/tracer/main/main.go
@@ -32,7 +32,7 @@ func (t *tracer) Stop() {
 }
 
 func main() {
-	dockerRegistry, err := docker.NewRegistry(pollInterval, nil, false)
+	dockerRegistry, err := docker.NewRegistry(pollInterval, nil, false, "")
 	if err != nil {
 		log.Fatalf("Could start docker watcher: %v", err)
 	}