diff --git a/weed/filer/mongodb/mongodb_store.go b/weed/filer/mongodb/mongodb_store.go
index 104d1f9e2..1fc67931a 100644
--- a/weed/filer/mongodb/mongodb_store.go
+++ b/weed/filer/mongodb/mongodb_store.go
@@ -128,7 +128,7 @@ func (store *MongodbStore) FindEntry(ctx context.Context, fullpath util.FullPath
 	var where = bson.M{"directory": dir, "name": name}
 	err = store.connect.Database(store.database).Collection(store.collectionName).FindOne(ctx, where).Decode(&data)
 	if err != mongo.ErrNoDocuments && err != nil {
-		glog.Error("find %s: %v", fullpath, err)
+		glog.Errorf("find %s: %v", fullpath, err)
 		return nil, filer_pb.ErrNotFound
 	}
 
diff --git a/weed/filer/mongodb/mongodb_store_kv.go b/weed/filer/mongodb/mongodb_store_kv.go
index 09508e691..4aa9c3a33 100644
--- a/weed/filer/mongodb/mongodb_store_kv.go
+++ b/weed/filer/mongodb/mongodb_store_kv.go
@@ -36,7 +36,7 @@ func (store *MongodbStore) KvGet(ctx context.Context, key []byte) (value []byte,
 	var where = bson.M{"directory": dir, "name": name}
 	err = store.connect.Database(store.database).Collection(store.collectionName).FindOne(ctx, where).Decode(&data)
 	if err != mongo.ErrNoDocuments && err != nil {
-		glog.Error("kv get: %v", err)
+		glog.Errorf("kv get: %v", err)
 		return nil, filer.ErrKvNotFound
 	}
 
@@ -54,7 +54,7 @@ func (store *MongodbStore) KvDelete(ctx context.Context, key []byte) (err error)
 	where := bson.M{"directory": dir, "name": name}
 	_, err = store.connect.Database(store.database).Collection(store.collectionName).DeleteOne(ctx, where)
 	if err != nil {
-		return fmt.Errorf("kv delete %s : %v", err)
+		return fmt.Errorf("kv delete: %v", err)
 	}
 
 	return nil