diff --git a/pkgs/development/ocaml-modules/estring/default.nix b/pkgs/development/ocaml-modules/estring/default.nix
deleted file mode 100644
index c0cc3398763c..000000000000
--- a/pkgs/development/ocaml-modules/estring/default.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-{ lib, buildOcaml, ocaml, fetchurl }:
-
-if lib.versionAtLeast ocaml.version "4.06"
-then throw "estring is not available for OCaml ${ocaml.version}"
-else
-
-buildOcaml rec {
-  pname = "estring";
-  version = "1.3";
-
-  src = fetchurl {
-    url = "https://forge.ocamlcore.org/frs/download.php/1012/estring-${version}.tar.gz";
-    sha256 = "0b6znz5igm8pp28w4b7sgy82rpd9m5aw6ss933rfbw1mrh05gvcg";
-  };
-
-  meta = with lib; {
-    homepage = "http://estring.forge.ocamlcore.org/";
-    description = "Extension for string literals";
-    license = licenses.bsd3;
-  };
-}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 4967bc82cb3a..39fd58dcd778 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -359,8 +359,6 @@ let
 
     erm_xmpp = callPackage ../development/ocaml-modules/erm_xmpp { };
 
-    estring = callPackage ../development/ocaml-modules/estring { };
-
     ethernet = callPackage ../development/ocaml-modules/ethernet { };
 
     ezjsonm = callPackage ../development/ocaml-modules/ezjsonm { };