diff --git a/packages/rocketchat-importer/server/classes/ImporterBase.js b/packages/rocketchat-importer/server/classes/ImporterBase.js
index 813d0f7354648..b2e412eaa083f 100644
--- a/packages/rocketchat-importer/server/classes/ImporterBase.js
+++ b/packages/rocketchat-importer/server/classes/ImporterBase.js
@@ -29,9 +29,9 @@ export class Base {
 	 * @static
 	 */
 	static getBSONSize(item) {
-		const { BSON } = require('bson');
-		const bson = new BSON();
-		return bson.calculateObjectSize(item);
+		const { calculateObjectSize } = require('bson');
+
+		return calculateObjectSize(item);
 	}
 
 	/**