diff --git a/config/config_source_test.go b/config/config_source_test.go
index eb7e95b3d..0c5605da2 100644
--- a/config/config_source_test.go
+++ b/config/config_source_test.go
@@ -22,7 +22,7 @@ func TestFileWatcherSource(t *testing.T) {
 
 	// capture logs
 	var logOutput bytes.Buffer
-	logger := zerolog.New(io.MultiWriter(&logOutput, zerolog.NewTestWriter(t)))
+	logger := zerolog.New(io.MultiWriter(zerolog.SyncWriter(&logOutput), zerolog.NewTestWriter(t)))
 	originalLogger := log.Logger()
 	log.SetLogger(&logger)
 	t.Cleanup(func() {