diff --git a/Keymaster.h b/Keymaster.h
index 42a2b5d..9a0616d 100644
--- a/Keymaster.h
+++ b/Keymaster.h
@@ -115,7 +115,7 @@
     bool isSecure();
 
   private:
-    std::unique_ptr<KmDevice> mDevice;
+    sp<KmDevice> mDevice;
     DISALLOW_COPY_AND_ASSIGN(Keymaster);
     static bool hmacKeyGenerated;
 };