diff --git a/pkgs/development/ocaml-modules/bstr/default.nix b/pkgs/development/ocaml-modules/bstr/default.nix
new file mode 100644
index 000000000000..37e342db4400
--- /dev/null
+++ b/pkgs/development/ocaml-modules/bstr/default.nix
@@ -0,0 +1,24 @@
+{
+  fetchurl,
+  buildDunePackage,
+  lib,
+}:
+
+buildDunePackage rec {
+  pname = "bstr";
+  version = "0.0.2";
+
+  minimalOCamlVersion = "4.13";
+
+  src = fetchurl {
+    url = "https://github.com/robur-coop/bstr/releases/download/v${version}/bstr-${version}.tbz";
+    hash = "sha256-/zvzCBzT014OesTmxGBDB98ZRU++YNDLUZ8uaDK3keM=";
+  };
+
+  meta = {
+    description = "A simple library for bigstrings";
+    homepage = "https://git.robur.coop/robur/bstr";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index f025e1cfd9f6..2be1c4535a94 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -145,6 +145,8 @@ let
 
         brr = callPackage ../development/ocaml-modules/brr { };
 
+        bstr = callPackage ../development/ocaml-modules/bstr { };
+
         bwd = callPackage ../development/ocaml-modules/bwd { };
 
         bytesrw = callPackage ../development/ocaml-modules/bytesrw { };