diff --git a/pkgs/tools/typesetting/tex/tetex/default.nix b/pkgs/tools/typesetting/tex/tetex/default.nix
index dd283c8aa0de..b5c09d0a2ccb 100644
--- a/pkgs/tools/typesetting/tex/tetex/default.nix
+++ b/pkgs/tools/typesetting/tex/tetex/default.nix
@@ -16,12 +16,12 @@ stdenv.mkDerivation rec {
   version = "3.0";
 
   src = fetchurl {
-    url = "http://mirrors.ctan.org/obsolete/systems/unix/teTeX/${version}/distrib/tetex-src-${version}.tar.gz";
+    url = "https://mirrors.ctan.org/obsolete/systems/unix/teTeX/${version}/distrib/tetex-src-${version}.tar.gz";
     sha256 = "16v44465ipd9yyqri9rgxp6rbgs194k4sh1kckvccvdsnnp7w3ww";
   };
 
   texmf = fetchurl {
-    url = "http://mirrors.ctan.org/obsolete/systems/unix/teTeX/${version}/distrib/tetex-texmf-${version}.tar.gz";
+    url = "https://mirrors.ctan.org/obsolete/systems/unix/teTeX/${version}/distrib/tetex-texmf-${version}.tar.gz";
     sha256 = "1hj06qvm02a2hx1a67igp45kxlbkczjlg20gr8lbp73l36k8yfvc";
   };