diff --git a/api/api_full.go b/api/api_full.go
index 9c967ca32..70da6dd88 100644
--- a/api/api_full.go
+++ b/api/api_full.go
@@ -862,6 +862,8 @@ const (
 
 func (v SyncStateStage) String() string {
 	switch v {
+	case StageIdle:
+		return "idle"
 	case StageHeaders:
 		return "header sync"
 	case StagePersistHeaders: