diff --git a/base/include/hidl/HidlSupport.h b/base/include/hidl/HidlSupport.h
index 7a5183b..2d0dc25 100644
--- a/base/include/hidl/HidlSupport.h
+++ b/base/include/hidl/HidlSupport.h
@@ -116,6 +116,10 @@
 
     // explicit conversion
     const native_handle_t *getNativeHandle() const;
+
+    // offsetof(hidl_handle, mHandle) exposed since mHandle is private.
+    static const size_t kOffsetOfNativeHandle;
+
 private:
     void freeHandle();