diff --git a/wimax_network_proxy.h b/wimax_network_proxy.h
index 3902af4..d1bccc1 100644
--- a/wimax_network_proxy.h
+++ b/wimax_network_proxy.h
@@ -24,6 +24,7 @@
   virtual int Type(Error *error);
   virtual int CINR(Error *error);
   virtual int RSSI(Error *error);
+  virtual int SignalStrength(Error *error);
 
  private:
   class Proxy : public org::chromium::WiMaxManager::Network_proxy,