diff --git a/common/action.h b/common/action.h
index fd82c2d..d32322c 100644
--- a/common/action.h
+++ b/common/action.h
@@ -98,7 +98,7 @@
   virtual void PerformAction() = 0;
 
   // Called on ActionProcess::ActionComplete() by ActionProcessor.
-  virtual void ActionCompleted(ErrorCode code) {}
+  virtual void ActionCompleted([[maybe_unused]] ErrorCode code) {}
 
   // Called by the ActionProcessor to tell this Action which processor
   // it belongs to.
diff --git a/common/action_processor.h b/common/action_processor.h
index ad98cc9..6108c3e 100644
--- a/common/action_processor.h
+++ b/common/action_processor.h
@@ -130,18 +130,19 @@
   // Called when all processing in an ActionProcessor has completed. A pointer
   // to the ActionProcessor is passed. |code| is set to the exit code of the
   // last completed action.
-  virtual void ProcessingDone(const ActionProcessor* processor,
-                              ErrorCode code) {}
+  virtual void ProcessingDone([[maybe_unused]] const ActionProcessor* processor,
+                              [[maybe_unused]] ErrorCode code) {}
 
   // Called when processing has stopped. Does not mean that all Actions have
   // completed. If/when all Actions complete, ProcessingDone() will be called.
-  virtual void ProcessingStopped(const ActionProcessor* processor) {}
+  virtual void ProcessingStopped(
+      [[maybe_unused]] const ActionProcessor* processor) {}
 
   // Called whenever an action has finished processing, either successfully
   // or otherwise.
-  virtual void ActionCompleted(ActionProcessor* processor,
-                               AbstractAction* action,
-                               ErrorCode code) {}
+  virtual void ActionCompleted([[maybe_unused]] ActionProcessor* processor,
+                               [[maybe_unused]] AbstractAction* action,
+                               [[maybe_unused]] ErrorCode code) {}
 };
 
 }  // namespace chromeos_update_engine