diff --git a/tools/testtool/freeport.go b/tools/testtool/freeport.go
index 437e0fd..84a9fde 100644
--- a/tools/testtool/freeport.go
+++ b/tools/testtool/freeport.go
@@ -42,7 +42,7 @@ func WaitForPort(l logger, timeout time.Duration, port string) error {
 	for {
 		select {
 		case <-stopTimer.C:
-			return fmt.Errorf("no server started listening on port %s after timeout %d", port, timeout)
+			return fmt.Errorf("no server started listening on port %s after timeout %s", port, timeout)
 		case <-t.C:
 			if err := portIsReady(port); err != nil {
 				l.Logf("waiting for port: %s\n", err)
diff --git a/tools/testtool/freeport_test.go b/tools/testtool/freeport_test.go
index 486fb44..2189fb7 100644
--- a/tools/testtool/freeport_test.go
+++ b/tools/testtool/freeport_test.go
@@ -33,5 +33,7 @@ func TestWaitForPort_timeout(t *testing.T) {
 	p, err := GetFreePort()
 	require.NoError(t, err)
 
-	require.Error(t, WaitForPort(t, time.Second, p))
+	err = WaitForPort(t, time.Second, p)
+	require.Error(t, err)
+	t.Log(err.Error())
 }