diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index fbc3f0ef38c0..c76537a6826a 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -825,7 +825,7 @@ void wbc_detach_inode(struct writeback_control *wbc)
 		 * is okay.  The main goal is avoiding keeping an inode on
 		 * the wrong wb for an extended period of time.
 		 */
-		if (hweight32(history) > WB_FRN_HIST_THR_SLOTS)
+		if (hweight16(history) > WB_FRN_HIST_THR_SLOTS)
 			inode_switch_wbs(inode, max_id);
 	}