diff --git a/packages/lib/shim-init-node.test.ts b/packages/lib/shim-init-node.test.ts
index cc98d91a0d..30527c2910 100644
--- a/packages/lib/shim-init-node.test.ts
+++ b/packages/lib/shim-init-node.test.ts
@@ -1,7 +1,7 @@
 
 const { shimInit } = require('./shim-init-node');
 import shim from './shim';
-import { setupDatabaseAndSynchronizer, supportDir } from './testing/test-utils';
+import { createTempDir, setupDatabaseAndSynchronizer, supportDir } from './testing/test-utils';
 import { copyFile } from 'fs-extra';
 
 describe('shim-init-node', () => {
@@ -19,8 +19,11 @@ describe('shim-init-node', () => {
 	});
 
 	test('should preserve the file extension if one is provided regardless of the mime type', async () => {
+		const tempDir = await createTempDir();
+
 		const originalFilePath = `${supportDir}/valid_pdf_without_ext`;
-		const fileWithDifferentExtension = `${originalFilePath}.mscz`;
+		const fileWithDifferentExtension = `${tempDir}/valid_pdf.mscz`;
+
 		await copyFile(originalFilePath, fileWithDifferentExtension);
 
 		const resource = await shim.createResourceFromPath(fileWithDifferentExtension);