diff --git a/ProjFS.Mac/PrjFSKext/PrjFSKext/KauthHandler.cpp b/ProjFS.Mac/PrjFSKext/PrjFSKext/KauthHandler.cpp
index 111c9355d..91e4e0041 100644
--- a/ProjFS.Mac/PrjFSKext/PrjFSKext/KauthHandler.cpp
+++ b/ProjFS.Mac/PrjFSKext/PrjFSKext/KauthHandler.cpp
@@ -670,6 +670,11 @@ static bool ShouldHandleFileOpEvent(
 {
     *root = RootHandle_None;
 
+    if (!VirtualizationRoot_VnodeIsOnAllowedFilesystem(vnode))
+    {
+        return false;
+    }
+
     vtype vnodeType = vnode_vtype(vnode);
     if (ShouldIgnoreVnodeType(vnodeType, vnode))
     {