diff --git a/pkgs/by-name/sp/spooles/package.nix b/pkgs/by-name/sp/spooles/package.nix
index f0256be80c8d..c413bb24e0e3 100644
--- a/pkgs/by-name/sp/spooles/package.nix
+++ b/pkgs/by-name/sp/spooles/package.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "2.2";
 
   src = fetchurl {
-    url = "http://www.netlib.org/linalg/spooles/spooles.${finalAttrs.version}.tgz";
+    url = "https://www.netlib.org/linalg/spooles/spooles.${finalAttrs.version}.tgz";
     sha256 = "1pf5z3vvwd8smbpibyabprdvcmax0grzvx2y0liy98c7x6h5jid8";
   };