diff --git a/pkgs/development/compilers/ocaml/ber-metaocaml.nix b/pkgs/development/compilers/ocaml/ber-metaocaml.nix
index 3110e7172a07..778aac812808 100644
--- a/pkgs/development/compilers/ocaml/ber-metaocaml.nix
+++ b/pkgs/development/compilers/ocaml/ber-metaocaml.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
   };
 
   metaocaml = fetchurl {
-    url = "http://okmij.org/ftp/ML/ber-metaocaml-${metaocamlPatch}.tar.gz";
+    url = "https://okmij.org/ftp/ML/ber-metaocaml-${metaocamlPatch}.tar.gz";
     sha256 = "sha256-vvq3xI4jSAsrXcDk97TPbFDYgO9NcQeN/yBcUbcb/y0=";
   };