diff --git a/opam b/opam
index a6056e18..80011e04 100644
--- a/opam
+++ b/opam
@@ -1,6 +1,6 @@
 opam-version: "1.2"
 name: "containers"
-version: "1.5"
+version: "1.5.1"
 author: "Simon Cruanes"
 maintainer: "simon.cruanes@inria.fr"
 build: [
diff --git a/src/core/CCFormat.ml b/src/core/CCFormat.ml
index 7e0dfa50..965ff9ed 100644
--- a/src/core/CCFormat.ml
+++ b/src/core/CCFormat.ml
@@ -5,6 +5,8 @@
 
 type 'a sequence = ('a -> unit) -> unit
 
+include Format
+
 type t = Format.formatter
 type 'a printer = t -> 'a -> unit
 
diff --git a/src/core/CCFormat.mli b/src/core/CCFormat.mli
index 65830791..a9f40d07 100644
--- a/src/core/CCFormat.mli
+++ b/src/core/CCFormat.mli
@@ -7,6 +7,8 @@
 
 type 'a sequence = ('a -> unit) -> unit
 
+include module type of Format
+
 type t = Format.formatter
 type 'a printer = t -> 'a -> unit