1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/ocaml-modules/opam-file-format/default.nix b/pkgs/development/ocaml-modules/opam-file-format/default.nix
index f61a690da190..4d308dc78b5f 100644
--- a/pkgs/development/ocaml-modules/opam-file-format/default.nix
+++ b/pkgs/development/ocaml-modules/opam-file-format/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "ocaml";
     repo = "opam-file-format";
-    rev = "${version}";
+    rev = version;
     sha256 = "0fqb99asnair0043hhc8r158d6krv5nzvymd0xwycr5y72yrp0hv";
   };