diff --git a/block.h b/block.h
index 2d24408..83e17ca 100644
--- a/block.h
+++ b/block.h
@@ -100,6 +100,7 @@
 
 /* disk I/O throttling */
 void bdrv_io_limits_enable(BlockDriverState *bs);
+void bdrv_io_limits_disable(BlockDriverState *bs);
 bool bdrv_io_limits_enabled(BlockDriverState *bs);
 
 void bdrv_init(void);