diff --git a/pkgs/by-name/it/itsx/package.nix b/pkgs/by-name/it/itsx/package.nix
index a6d51625e7e8..a59ebed5838c 100644
--- a/pkgs/by-name/it/itsx/package.nix
+++ b/pkgs/by-name/it/itsx/package.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation (finalAttrs: {
   pname = "itsx";
 
   src = fetchurl {
-    url = "http://microbiology.se/sw/ITSx_${finalAttrs.version}.tar.gz";
+    url = "https://microbiology.se/sw/ITSx_${finalAttrs.version}.tar.gz";
     sha256 = "0lrmy2n3ax7f208k0k8l3yz0j5cpz05hv4hx1nnxzn0c51z1pc31";
   };