diff --git a/include/ntapi/nt_file.h b/include/ntapi/nt_file.h
index 885a7d8..cb27bdf 100644
--- a/include/ntapi/nt_file.h
+++ b/include/ntapi/nt_file.h
@@ -964,7 +964,7 @@ typedef int32_t	__stdcall ntapi_zw_read_file(
 	__in	void *			hevent		__optional,
 	__in	nt_io_apc_routine *	apc_routine	__optional,
 	__in	void *			apc_context	__optional,
-	__out	nt_io_status_block *	io_status_block,
+	__out	nt_iosb volatile *	io_status_block,
 	__out	void *			buffer,
 	__in	uint32_t		bytes_to_read,
 	__in	nt_large_integer *	byte_offset	__optional,
@@ -976,7 +976,7 @@ typedef int32_t __stdcall ntapi_zw_write_file(
 	__in 	void *			hevent		__optional,
 	__in	nt_io_apc_routine *	apc_routine	__optional,
 	__in	void * 			apc_context	__optional,
-	__out	nt_io_status_block * 	io_status_block,
+	__out	nt_iosb volatile *	io_status_block,
 	__in	void * 			buffer,
 	__in	uint32_t		bytes_sent,
 	__in	nt_large_integer *	byte_offset	__optional,
@@ -988,7 +988,7 @@ typedef int32_t	__stdcall ntapi_zw_read_file_scatter(
 	__in	void *				hevent		__optional,
 	__in	nt_io_apc_routine *		apc_routine	__optional,
 	__in	void *				apc_context	__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__in	nt_file_segment_element *	buffer,
 	__in	uint32_t			bytes_to_read,
 	__in	nt_large_integer *		byte_offset	__optional,
@@ -1000,7 +1000,7 @@ typedef int32_t	__stdcall ntapi_zw_write_file_gather(
 	__in	void *				hevent		__optional,
 	__in	nt_io_apc_routine *		apc_routine	__optional,
 	__in	void *				apc_context	__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__in	nt_file_segment_element *	buffer,
 	__in	uint32_t			bytes_to_read,
 	__in	nt_large_integer *		byte_offset	__optional,
@@ -1012,7 +1012,7 @@ typedef int32_t	__stdcall ntapi_zw_lock_file(
 	__in	void *				hevent		__optional,
 	__in	nt_io_apc_routine *		apc_routine	__optional,
 	__in	void *				apc_context	__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__in	nt_large_integer *		lock_offset,
 	__in	nt_large_integer *		lock_length,
 	__in	uint32_t			key,
@@ -1033,7 +1033,7 @@ typedef int32_t	__stdcall ntapi_zw_device_io_control_file(
 	__in	void *				hevent			__optional,
 	__in	nt_io_apc_routine *		apc_routine		__optional,
 	__in	void *				apc_context		__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__in	uint32_t			io_control_code,
 	__in	void *				input_buffer		__optional,
 	__in	uint32_t			input_buffer_length,
@@ -1046,7 +1046,7 @@ typedef int32_t	__stdcall ntapi_zw_fs_control_file(
 	__in	void *				hevent			__optional,
 	__in	nt_io_apc_routine *		apc_routine		__optional,
 	__in	void *				apc_context		__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__in	uint32_t			fs_control_code,
 	__in	void *				input_buffer		__optional,
 	__in	uint32_t			input_buffer_length,
@@ -1059,7 +1059,7 @@ typedef int32_t	__stdcall ntapi_zw_notify_change_directory_file(
 	__in	void *				hevent			__optional,
 	__in	nt_io_apc_routine *		apc_routine		__optional,
 	__in	void *				apc_context		__optional,
-	__out	nt_io_status_block *		io_status_block,
+	__out	nt_iosb volatile *		io_status_block,
 	__out	nt_file_notify_information *	buffer,
 	__in	uint32_t			buffer_length,
 	__in	uint32_t			notify_filter,
@@ -1163,7 +1163,7 @@ typedef int32_t	__stdcall ntapi_zw_query_directory_file(
 	__in	void *			hevent		__optional,
 	__in	nt_io_apc_routine *	apc_routine	__optional,
 	__in	void *			apc_context	__optional,
-	__out	nt_io_status_block *	io_status_block,
+	__out	nt_iosb volatile *	io_status_block,
 	__out	void *			file_info,
 	__in	uint32_t		file_info_length,
 	__in	nt_file_info_class	file_info_class,