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-rw-r--r--kernel/uint63_31.ml4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/uint63_31.ml b/kernel/uint63_31.ml
index 5b2d934b5d..696efacb32 100644
--- a/kernel/uint63_31.ml
+++ b/kernel/uint63_31.ml
@@ -72,12 +72,12 @@ let l_xor x y = Int64.logxor x y
(* addition of int63 *)
let add x y = mask63 (Int64.add x y)
-let addcarry x y = add (add x y) Int64.one
+let addcarry x y = mask63 Int64.(add (add x y) one)
(* subtraction *)
let sub x y = mask63 (Int64.sub x y)
-let subcarry x y = sub (sub x y) Int64.one
+let subcarry x y = mask63 Int64.(sub (sub x y) one)
(* multiplication *)
let mul x y = mask63 (Int64.mul x y)