diff --git a/core/jni/android_os_HwBlob.h b/core/jni/android_os_HwBlob.h
index 39393cb..6b1db63 100644
--- a/core/jni/android_os_HwBlob.h
+++ b/core/jni/android_os_HwBlob.h
@@ -50,6 +50,8 @@
             size_t offset, const android::hardware::hidl_string **s) const;
 
     const void *data() const;
+    void *data();
+
     size_t size() const;
 
     status_t putBlob(size_t offset, const sp<JHwBlob> &blob);