diff --git a/extern/ogre-ffmpeg-videoplayer/audiofactory.hpp b/extern/ogre-ffmpeg-videoplayer/audiofactory.hpp
index cf1ff46a8..06abd6a74 100644
--- a/extern/ogre-ffmpeg-videoplayer/audiofactory.hpp
+++ b/extern/ogre-ffmpeg-videoplayer/audiofactory.hpp
@@ -12,6 +12,7 @@ class MovieAudioFactory
 {
 public:
     virtual boost::shared_ptr<MovieAudioDecoder> createDecoder(VideoState* videoState) = 0;
+    virtual ~MovieAudioFactory() {}
 };
 
 }