1 files changed, 1 insertions, 1 deletions
diff --git a/src/mxf.h b/src/mxf.h
index 89e4f635..73ada433 100644
--- a/src/mxf.h
+++ b/src/mxf.h
@@ -80,7 +80,7 @@ public:
 		return _key_id;
 	}
 
-	void set_key (Key);
+	virtual void set_key (Key);
 
 	/** @return encryption/decryption key, if one has been set */
 	boost::optional<Key> key () const {