diff --git a/connection_manager_interface.h b/connection_manager_interface.h
index d36ef76..df8eb4b 100644
--- a/connection_manager_interface.h
+++ b/connection_manager_interface.h
@@ -17,12 +17,16 @@
 #ifndef UPDATE_ENGINE_CONNECTION_MANAGER_INTERFACE_H_
 #define UPDATE_ENGINE_CONNECTION_MANAGER_INTERFACE_H_
 
+#include <memory>
+
 #include <base/macros.h>
 
 #include "update_engine/connection_utils.h"
 
 namespace chromeos_update_engine {
 
+class SystemState;
+
 // This class exposes a generic interface to the connection manager
 // (e.g FlimFlam, Shill, etc.) to consolidate all connection-related
 // logic in update_engine.
@@ -49,6 +53,12 @@
   DISALLOW_COPY_AND_ASSIGN(ConnectionManagerInterface);
 };
 
+namespace connection_manager {
+// Factory function which creates a ConnectionManager.
+std::unique_ptr<ConnectionManagerInterface> CreateConnectionManager(
+    SystemState* system_state);
+}
+
 }  // namespace chromeos_update_engine
 
 #endif  // UPDATE_ENGINE_CONNECTION_MANAGER_INTERFACE_H_