diff --git a/pkgs/development/ocaml-modules/wtf8/default.nix b/pkgs/development/ocaml-modules/wtf8/default.nix
index 7f3686abb51..4c820d13808 100644
--- a/pkgs/development/ocaml-modules/wtf8/default.nix
+++ b/pkgs/development/ocaml-modules/wtf8/default.nix
@@ -4,7 +4,7 @@ buildDunePackage rec {
   pname = "wtf8";
   version = "1.0.1";
 
-  minimumOCamlVersion = "4.01";
+  minimumOCamlVersion = "4.02";
 
   src = fetchurl {
     url = "https://github.com/flowtype/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz";