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--- a/src/internfile/mh_mbox.h
+++ b/src/internfile/mh_mbox.h
@@ -39,7 +39,7 @@
 	m_ipath = ipath;
 	return true;
     }
-    virtual void clear();
+    virtual void clear_impl() override;
     typedef long long mbhoff_type;
 
 protected: