diff --git a/src/vs/workbench/contrib/files/test/browser/fileEditorInput.test.ts b/src/vs/workbench/contrib/files/test/browser/fileEditorInput.test.ts
index 9bf3ad060f3..8e0e190bf45 100644
--- a/src/vs/workbench/contrib/files/test/browser/fileEditorInput.test.ts
+++ b/src/vs/workbench/contrib/files/test/browser/fileEditorInput.test.ts
@@ -284,7 +284,7 @@ suite('Files - FileEditorInput', () => {
 		}
 
 		const inputWithPreferredResourceDeserialized = factory.deserialize(instantiationService, inputWithPreferredResourceSerialized) as FileEditorInput;
-		assert.equal(inputWithPreferredResource.preferredResource.toString(), inputWithPreferredResourceDeserialized.resource.toString());
+		assert.equal(inputWithPreferredResource.resource.toString(), inputWithPreferredResourceDeserialized.resource.toString());
 		assert.equal(inputWithPreferredResource.preferredResource.toString(), inputWithPreferredResourceDeserialized.preferredResource.toString());
 	});
 });