diff --git a/source/dcdt/se/sr_class_manager.h b/source/dcdt/se/sr_class_manager.h
index aeaf8eea55..3379436dec 100644
--- a/source/dcdt/se/sr_class_manager.h
+++ b/source/dcdt/se/sr_class_manager.h
@@ -17,9 +17,9 @@ class SrClassManagerBase : public SrSharedClass
     virtual void* alloc ()=0;
     virtual void* alloc ( const void* obj )=0;
     virtual void free ( void* obj )=0;
-    virtual void output ( SrOutput& o, const void* obj ) { }
-    virtual void input ( SrInput& i, void* obj ) { }
-    virtual int compare ( const void* obj1, const void* obj2 ) { return 0; }
+    virtual void output ( SrOutput& UNUSED(o), const void* UNUSED(obj) ) { }
+    virtual void input ( SrInput& UNUSED(i), void* UNUSED(obj) ) { }
+    virtual int compare ( const void* UNUSED(obj1), const void* UNUSED(obj2) ) { return 0; }
  };
 
 /*! Example of an implementation of a class to be automatically managed