diff --git a/lib/mks-types.h b/lib/mks-types.h
index 33eaddd..8ac93ef 100644
--- a/lib/mks-types.h
+++ b/lib/mks-types.h
@@ -36,9 +36,4 @@ typedef struct _MksScreen              MksScreen;
 typedef struct _MksSession             MksSession;
 typedef struct _MksScreenAttributes    MksScreenAttributes;
 
-typedef struct _MksAudio     MksAudio;
-typedef struct _MksChardev   MksChardev;
-typedef struct _MksClipboard MksClipboard;
-typedef struct _MksUsb       MksUsb;
-
 G_END_DECLS