diff --git a/aegisub/src/video_context.h b/aegisub/src/video_context.h
index 396572dc7..d36459537 100644
--- a/aegisub/src/video_context.h
+++ b/aegisub/src/video_context.h
@@ -53,15 +53,11 @@
 #include <libaegisub/vfr.h>
 
 class AegiVideoFrame;
-class SubtitlesGrid;
 class AudioProvider;
-class AudioDisplay;
-class AssDialogue;
 class SubtitlesProviderErrorEvent;
 class ThreadedFrameSource;
 class VideoProvider;
 class VideoProviderErrorEvent;
-class AudioController;
 
 namespace agi {
 	struct Context;