diff --git a/system_state.h b/system_state.h
index 2ba0272..7923217 100644
--- a/system_state.h
+++ b/system_state.h
@@ -51,6 +51,7 @@
 class PayloadStateInterface;
 class PrefsInterface;
 class UpdateAttempter;
+class WeaveServiceInterface;
 
 // An interface to global system context, including platform resources,
 // the current state of the system, high-level objects whose lifetime is same
@@ -98,6 +99,9 @@
   // Returns a pointer to the update attempter object.
   virtual UpdateAttempter* update_attempter() = 0;
 
+  // Returns a pointer to the WeaveServiceInterface class or nullptr if none.
+  virtual WeaveServiceInterface* weave_service() = 0;
+
   // Returns a pointer to the object that stores the parameters that are
   // common to all Omaha requests.
   virtual OmahaRequestParams* request_params() = 0;