diff --git a/cmd/esbulk/esbulk.go b/cmd/esbulk/esbulk.go
index c5c5b93..7f5cca9 100644
--- a/cmd/esbulk/esbulk.go
+++ b/cmd/esbulk/esbulk.go
@@ -191,11 +191,14 @@ func main() {
 		if *verbose {
 			log.Printf("on shutdown, number_of_replicas will be set back to %s", numberOfReplicas)
 		}
-
+		refreshInterval := *refreshInterval
+		if *verbose {
+			log.Printf("on shutdown, refresh_interval will be set back to %s", refreshInterval)
+		}
 		// Shutdown procedure. TODO(miku): Handle signals, too.
 		defer func() {
 			// Realtime search.
-			if _, err := indexSettingsRequest(fmt.Sprintf(`{"index": {"refresh_interval": %s}}`, refreshInterval), options); err != nil {
+			if _, err := indexSettingsRequest(fmt.Sprintf(`{"index": {"refresh_interval": "%s"}}`, refreshInterval), options); err != nil {
 				log.Fatal(err)
 			}
 			// Reset number of replicas.