diff --git a/packages/oauth/src/stores/file-store.ts b/packages/oauth/src/stores/file-store.ts
index b79adfa95..f0f01c107 100644
--- a/packages/oauth/src/stores/file-store.ts
+++ b/packages/oauth/src/stores/file-store.ts
@@ -90,11 +90,13 @@ export class FileInstallationStore implements InstallationStore {
       const allFiles = fs.readdirSync(installationDir);
       filesToDelete = filesToDelete.concat(allFiles);
     } else {
+      // tslint:disable-next-line:ter-arrow-parens
       const userFiles = fs.readdirSync(installationDir).filter(file => file.includes(`user-${userId}-`));
       filesToDelete = filesToDelete.concat(userFiles);
     }
 
     try {
+      // tslint:disable-next-line:ter-arrow-parens
       filesToDelete.map(filePath => deleteFile(path.resolve(`${installationDir}/${filePath}`)));
     } catch (err) {
       throw new Error('Failed to delete installation from FileInstallationStore');