diff --git a/pkgs/by-name/st/stacks/package.nix b/pkgs/by-name/st/stacks/package.nix
index 6348636f15e6..46bed3ec1250 100644
--- a/pkgs/by-name/st/stacks/package.nix
+++ b/pkgs/by-name/st/stacks/package.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation (finalAttrs: {
   pname = "stacks";
   version = "2.68";
   src = fetchurl {
-    url = "http://catchenlab.life.illinois.edu/stacks/source/stacks-${finalAttrs.version}.tar.gz";
+    url = "https://catchenlab.life.illinois.edu/stacks/source/stacks-${finalAttrs.version}.tar.gz";
     sha256 = "sha256-ncUeo1bWDrRVewstGohUqvrkkq7Yf5dOAknMCapedlA=";
   };