diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index c798959..c7102e3 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -136,6 +136,8 @@
 
     void destroyDsuMetadataKey(@utf8InCpp String dsuSlot);
 
+    long getStorageSize();
+
     const int FSTRIM_FLAG_DEEP_TRIM = 1;
 
     const int MOUNT_FLAG_PRIMARY = 1;