diff --git a/README.adoc b/README.adoc
index af4584ee..d3f40103 100644
--- a/README.adoc
+++ b/README.adoc
@@ -116,6 +116,7 @@ Documentation http://cedeela.fr/~simon/software/containers[here].
 - `CCHash` (hashing combinators)
 - `CCError` (monadic error handling, very useful)
 - `CCIO`, basic utilities for IO (channels, files)
+- `CCInt64,` utils for `int64`
 
 === Containers.data
 
diff --git a/_oasis b/_oasis
index 26c4e732..da751ead 100644
--- a/_oasis
+++ b/_oasis
@@ -45,7 +45,7 @@ Library "containers"
   Path:             src/core
   Modules:          CCVector, CCPrint, CCError, CCHeap, CCList, CCOpt, CCPair,
                     CCFun, CCHash, CCInt, CCBool, CCFloat, CCArray, CCRef, CCSet,
-                    CCOrd, CCRandom, CCString, CCHashtbl, CCMap, CCFormat, CCIO,
+                    CCOrd, CCRandom, CCString, CCHashtbl, CCMap, CCFormat, CCIO, CCInt64,
                     Containers
   BuildDepends:     bytes
   # BuildDepends:     bytes, bisect_ppx
diff --git a/doc/intro.txt b/doc/intro.txt
index e372616f..05b4cd88 100644
--- a/doc/intro.txt
+++ b/doc/intro.txt
@@ -33,6 +33,7 @@ CCHash
 CCHashtbl
 CCHeap
 CCInt
+CCInt64
 CCIO
 CCList
 CCMap
diff --git a/src/core/CCInt64.ml b/src/core/CCInt64.ml
new file mode 100644
index 00000000..d21c14a8
--- /dev/null
+++ b/src/core/CCInt64.ml
@@ -0,0 +1,56 @@
+
+(* This file is free software, part of containers. See file "license" for more details. *)
+
+include Int64
+
+let (+) = add
+
+let (-) = sub
+
+let (~-) = neg
+
+let ( * ) = mul
+
+let (/) = div
+
+let (mod) = rem
+
+let (land) = logand
+
+let (lor) = logor
+
+let (lxor) = logxor
+
+let lnot = lognot
+
+let (lsl) = shift_left
+
+let (lsr) = shift_right_logical
+
+let (asr) = shift_right
+
+let equal (x:t) y = x=y
+
+let hash x = Pervasives.abs (to_int x)
+
+(** {2 Conversion} *)
+
+let of_int_exn = of_int
+
+let of_int x = try Some (of_int_exn x) with Failure _ -> None
+
+let of_nativeint_exn = of_nativeint
+
+let of_nativeint x = try Some (of_nativeint_exn x) with Failure _ -> None
+
+let of_int32_exn = of_int32
+
+let of_int32 x = try Some (of_int32_exn x) with Failure _ -> None
+
+let of_float_exn = of_float
+
+let of_float x = try Some (of_float_exn x) with Failure _ -> None
+
+let of_string_exn = of_string
+
+let of_string x = try Some (of_string_exn x) with Failure _ -> None
diff --git a/src/core/CCInt64.mli b/src/core/CCInt64.mli
new file mode 100644
index 00000000..9f30e4c0
--- /dev/null
+++ b/src/core/CCInt64.mli
@@ -0,0 +1,81 @@
+
+(* This file is free software, part of containers. See file "license" for more details. *)
+
+(** {1 Int64}
+
+ Helpers for in64.
+
+ @since NEXT_RELEASE *)
+
+type t = int64
+
+val (+) : t -> t -> t
+
+val (-) : t -> t -> t
+
+val (~-) : t -> t
+
+val ( * ) : t -> t -> t
+
+val (/) : t -> t -> t
+
+val (mod) : t -> t -> t
+
+val abs : t -> t
+
+val max_int : t
+
+val min_int : t
+
+val (land) : t -> t -> t
+
+val (lor) : t -> t -> t
+
+val (lxor) : t -> t -> t
+
+val lnot : t -> t
+
+val (lsl) : t -> int -> t
+
+val (lsr) : t -> int -> t
+
+val (asr) : t -> int -> t
+
+val equal : t -> t -> bool
+
+val compare : t -> t -> int
+
+val hash : t -> int
+
+(** {2 Conversion} *)
+
+val to_int : t -> int
+
+val of_int : int -> t option
+
+val of_int_exn : int -> t
+
+val to_int32 : t -> int32
+
+val of_int32 : int32 -> t option
+
+val of_int32_exn : int32 -> t
+
+val to_nativeint : t -> nativeint
+
+val of_nativeint : nativeint -> t option
+
+val of_nativeint_exn : nativeint -> t
+
+val to_float : t -> float
+
+val of_float : float -> t option
+
+val of_float_exn : float -> t
+
+val to_string : t -> string
+
+val of_string : string -> t option
+
+val of_string_exn : string -> t
+