diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index f1e463a..29a63af 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -54,7 +54,7 @@
 
     void remountUid(int uid, int remountMode);
 
-    void setupAppDir(@utf8InCpp String path, @utf8InCpp String appDirRoot, int appUid);
+    void setupAppDir(@utf8InCpp String path, int appUid);
 
     @utf8InCpp String createObb(@utf8InCpp String sourcePath, @utf8InCpp String sourceKey,
                                 int ownerGid);