diff --git a/pkgs/development/tcl-modules/by-name/td/tdom/package.nix b/pkgs/development/tcl-modules/by-name/td/tdom/package.nix
index 12d9290417af..e5c74a2a7811 100644
--- a/pkgs/development/tcl-modules/by-name/td/tdom/package.nix
+++ b/pkgs/development/tcl-modules/by-name/td/tdom/package.nix
@@ -12,7 +12,7 @@ mkTclDerivation rec {
   version = "0.9.6";
 
   src = fetchzip {
-    url = "http://tdom.org/downloads/tdom-${version}-src.tgz";
+    url = "https://tdom.org/downloads/tdom-${version}-src.tgz";
     hash = "sha256-zN855tb9JQUtcB7K1DeAjUBrqhoNH44KbeHwp3qewqw=";
   };