diff --git a/mock_link_monitor.h b/mock_link_monitor.h
index 083b5d2..b76137d 100644
--- a/mock_link_monitor.h
+++ b/mock_link_monitor.h
@@ -18,7 +18,8 @@
 
   MOCK_METHOD0(Start, bool());
   MOCK_METHOD0(Stop, void());
-  MOCK_METHOD0(GetResponseTimeMilliseconds, unsigned int());
+  MOCK_CONST_METHOD0(GetResponseTimeMilliseconds, unsigned int());
+  MOCK_CONST_METHOD0(IsGatewayFound, bool());
 
   DISALLOW_COPY_AND_ASSIGN(MockLinkMonitor);
 };