1 files changed, 1 insertions, 1 deletions

diff --git a/src/engine/cache.h b/src/engine/cache.h
index f8ad2a90..a00c50b7 100644
--- a/src/engine/cache.h
+++ b/src/engine/cache.h
@@ -16,7 +16,7 @@ HRESULT CacheInitialize(
     __in_z_opt LPCWSTR wzSourceProcessPath
     );
 HRESULT CacheEnsureWorkingFolder(
-    __in_z LPCWSTR wzBundleId,
+    __in_z_opt LPCWSTR wzBundleId,
     __deref_out_z_opt LPWSTR* psczWorkingFolder
     );
 HRESULT CacheCalculateBundleWorkingPath(