diff --git a/pkgs/development/tools/ocaml/findlib/default.nix b/pkgs/development/tools/ocaml/findlib/default.nix
index 160ac54df903..6864132d99c3 100644
--- a/pkgs/development/tools/ocaml/findlib/default.nix
+++ b/pkgs/development/tools/ocaml/findlib/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   version = "1.9.8";
 
   src = fetchurl {
-    url = "http://download.camlcity.org/download/findlib-${version}.tar.gz";
+    url = "https://download.camlcity.org/download/findlib-${version}.tar.gz";
     hash = "sha256-ZiyRD3dOn+46GcTgV/OAWBqy/E7lLaR2EwSsnDG4hp0=";
   };