diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 28fce6c..7dd12bb 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -299,7 +299,7 @@
 
 #define ubh_get_addr16(ubh,begin) \
 	(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
-	((begin) & (uspi->fsize>>1) - 1)))
+	((begin) & ((uspi->fsize>>1) - 1)))
 
 #define ubh_get_addr32(ubh,begin) \
 	(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \