diff --git a/util/tee.go b/util/tee.go
index b1d587099..278ade002 100644
--- a/util/tee.go
+++ b/util/tee.go
@@ -12,7 +12,7 @@ type Tee struct {
 
 // Attach creates a new receiver channel and attaches it to the tee
 func (t *Tee) Attach() <-chan Param {
-	out := make(chan Param)
+	out := make(chan Param, 1)
 	t.add(out)
 	return out
 }