diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 7300ecd..9344547 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -109,8 +109,8 @@
 extern unsigned long dirty_background_bytes;
 extern int vm_dirty_ratio;
 extern unsigned long vm_dirty_bytes;
-extern int dirty_writeback_interval;
-extern int dirty_expire_interval;
+extern unsigned int dirty_writeback_interval;
+extern unsigned int dirty_expire_interval;
 extern int vm_highmem_is_dirtyable;
 extern int block_dump;
 extern int laptop_mode;