diff --git a/circuitbreaker_test.go b/circuitbreaker_test.go
index 79aa143..96821bd 100644
--- a/circuitbreaker_test.go
+++ b/circuitbreaker_test.go
@@ -323,15 +323,12 @@ func TestThresholdBreakerResets(t *testing.T) {
 }
 
 func TestTimeoutBreaker(t *testing.T) {
-	wait := make(chan struct{})
-
 	c := clock.NewMock()
-	called := int32(0)
+	var called int32
 
 	circuit := func() error {
-		wait <- struct{}{}
 		atomic.AddInt32(&called, 1)
-		<-wait
+		c.Add(time.Millisecond * 3)
 		return nil
 	}
 
@@ -341,19 +338,16 @@ func TestTimeoutBreaker(t *testing.T) {
 	errc := make(chan error)
 	go func() { errc <- cb.Call(circuit, time.Millisecond) }()
 
-	<-wait
-	c.Add(time.Millisecond * 3)
-	wait <- struct{}{}
-
 	err := <-errc
 	if err == nil {
 		t.Fatal("expected timeout breaker to return an error")
 	}
 
+	if atomic.LoadInt32(&called) != 1 {
+		t.Fatal("expected circuit be called once")
+	}
+
 	go cb.Call(circuit, time.Millisecond)
-	<-wait
-	c.Add(time.Millisecond * 3)
-	wait <- struct{}{}
 
 	if !cb.Tripped() {
 		t.Fatal("expected timeout breaker to be open")
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..d3d6d94
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module github.com/rubyist/circuitbreaker
+
+go 1.21.0
+
+require (
+	github.com/cenkalti/backoff v2.2.1+incompatible
+	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a
+	github.com/peterbourgon/g2s v0.0.0-20170223122336-d4e7ad98afea
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..28e688b
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,6 @@
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a h1:yDWHCSQ40h88yih2JAcL6Ls/kVkSE8GFACTGVnMPruw=
+github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a/go.mod h1:7Ga40egUymuWXxAe151lTNnCv97MddSOVsjpPPkityA=
+github.com/peterbourgon/g2s v0.0.0-20170223122336-d4e7ad98afea h1:sKwxy1H95npauwu8vtF95vG/syrL0p8fSZo/XlDg5gk=
+github.com/peterbourgon/g2s v0.0.0-20170223122336-d4e7ad98afea/go.mod h1:1VcHEd3ro4QMoHfiNl/j7Jkln9+KQuorp0PItHMJYNg=