diff --git a/cmd/syncthing/main.go b/cmd/syncthing/main.go
index 17cf12811..0c013abe1 100644
--- a/cmd/syncthing/main.go
+++ b/cmd/syncthing/main.go
@@ -1121,6 +1121,8 @@ func cleanConfigDirectory() {
 		"panic-*.log":      7 * 24 * time.Hour,  // keep panic logs for a week
 		"audit-*.log":      7 * 24 * time.Hour,  // keep audit logs for a week
 		"index":            14 * 24 * time.Hour, // keep old index format for two weeks
+		"index-v0.11.0.db": 14 * 24 * time.Hour, // keep old index format for two weeks
+		"index-v0.13.0.db": 14 * 24 * time.Hour, // keep old index format for two weeks
 		"index*.converted": 14 * 24 * time.Hour, // keep old converted indexes for two weeks
 		"config.xml.v*":    30 * 24 * time.Hour, // old config versions for a month
 		"*.idx.gz":         30 * 24 * time.Hour, // these should for sure no longer exist