diff --git a/packages/backend-test-utils/src/filesystem/MockDirectory.ts b/packages/backend-test-utils/src/filesystem/MockDirectory.ts
index 499c7f29fb..2f949987f5 100644
--- a/packages/backend-test-utils/src/filesystem/MockDirectory.ts
+++ b/packages/backend-test-utils/src/filesystem/MockDirectory.ts
@@ -238,7 +238,7 @@ export class MockDirectory {
       const fullPath = resolvePath(this.#root, entry.path);
       if (!isChildPath(this.#root, fullPath)) {
         throw new Error(
-          `Provided path must resolve to a child path of the mock directory, got '${entry.path}'`,
+          `Provided path must resolve to a child path of the mock directory, got '${fullPath}'`,
         );
       }