diff --git a/infer/src/IR/IntLit.re b/infer/src/IR/IntLit.re
index 56a24ad3d..55416af67 100644
--- a/infer/src/IR/IntLit.re
+++ b/infer/src/IR/IntLit.re
@@ -62,7 +62,7 @@ let of_int64_unsigned i unsigned => (unsigned, i, false);
 
 let of_int i => of_int64 (Int64.of_int i);
 
-let to_int (_, i, _) => Int64.to_int i;
+let to_int (_, i, _) => Int64.to_int_exn i;
 
 let null = (false, 0L, true);
 
@@ -94,21 +94,21 @@ let lift binop (unsigned1, i1, ptr1) (unsigned2, i2, ptr2) => (
 
 let lift1 unop (unsigned, i, ptr) => (unsigned, unop i, ptr);
 
-let add i1 i2 => lift Int64.add i1 i2;
+let add i1 i2 => lift Int64.(+) i1 i2;
 
-let mul i1 i2 => lift Int64.mul i1 i2;
+let mul i1 i2 => lift Int64.( * ) i1 i2;
 
-let div i1 i2 => lift Int64.div i1 i2;
+let div i1 i2 => lift Int64.(/) i1 i2;
 
 let rem i1 i2 => lift Int64.rem i1 i2;
 
-let logand i1 i2 => lift Int64.logand i1 i2;
+let logand i1 i2 => lift Int64.bit_and i1 i2;
 
-let logor i1 i2 => lift Int64.logor i1 i2;
+let logor i1 i2 => lift Int64.bit_or i1 i2;
 
-let logxor i1 i2 => lift Int64.logxor i1 i2;
+let logxor i1 i2 => lift Int64.bit_xor i1 i2;
 
-let lognot i => lift1 Int64.lognot i;
+let lognot i => lift1 Int64.bit_not i;
 
 let sub i1 i2 => add i1 (neg i2);
 
diff --git a/infer/src/backend/dom.ml b/infer/src/backend/dom.ml
index 27a5347e9..0a2beb168 100644
--- a/infer/src/backend/dom.ml
+++ b/infer/src/backend/dom.ml
@@ -1560,10 +1560,10 @@ let sigma_partial_meet tenv (sigma1: Prop.sigma) (sigma2: Prop.sigma) : Prop.sig
 
 let widening_top =
   (* nearly max_int but not so close to overflow *)
-  IntLit.of_int64 Int64.max_int -- IntLit.of_int 1000
+  IntLit.of_int64 Int64.max_value -- IntLit.of_int 1000
 let widening_bottom =
   (* nearly min_int but not so close to underflow *)
-  IntLit.of_int64 Int64.min_int ++ IntLit.of_int 1000
+  IntLit.of_int64 Int64.min_value ++ IntLit.of_int 1000
 
 (** {2 Join and Meet for Pi} *)
 let pi_partial_join tenv mode
diff --git a/infer/src/base/Utils.ml b/infer/src/base/Utils.ml
index b7bc93986..ad23a3c50 100644
--- a/infer/src/base/Utils.ml
+++ b/infer/src/base/Utils.ml
@@ -21,6 +21,9 @@ module Fn = Core.Std.Fn
 module Gc = Core.Std.Gc
 module In_channel = Core.Std.In_channel
 module Int = Core.Std.Int
+module Int32 = Core.Std.Int32
+module Int63 = Core.Std.Int63
+module Int64 = Core.Std.Int64
 module Option = Core.Std.Option
 module Pid = Core.Std.Pid
 module Signal = Core.Std.Signal
diff --git a/infer/src/base/Utils.mli b/infer/src/base/Utils.mli
index 282e964bf..53ebd3d9c 100644
--- a/infer/src/base/Utils.mli
+++ b/infer/src/base/Utils.mli
@@ -21,6 +21,9 @@ module Fn = Core.Std.Fn
 module Gc = Core.Std.Gc
 module In_channel = Core.Std.In_channel
 module Int = Core.Std.Int
+module Int32 = Core.Std.Int32
+module Int63 = Core.Std.Int63
+module Int64 = Core.Std.Int64
 module Option = Core.Std.Option
 module Pid = Core.Std.Pid
 module Signal = Core.Std.Signal