diff --git a/drivers/staging/comedi/drivers/ni_tio.h b/drivers/staging/comedi/drivers/ni_tio.h
index 7ddafdd74095..4978358f9b13 100644
--- a/drivers/staging/comedi/drivers/ni_tio.h
+++ b/drivers/staging/comedi/drivers/ni_tio.h
@@ -19,10 +19,6 @@
 
 #include "../comedidev.h"
 
-/* forward declarations */
-struct mite_struct;
-struct ni_gpct_device;
-
 enum ni_gpct_register {
 	NITIO_G0_AUTO_INC,
 	NITIO_G1_AUTO_INC,