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-rw-r--r--pkgs/applications/science/logic/isabelle/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/logic/isabelle/default.nix b/pkgs/applications/science/logic/isabelle/default.nix
index af2bb3ed0c4..ae04c11d959 100644
--- a/pkgs/applications/science/logic/isabelle/default.nix
+++ b/pkgs/applications/science/logic/isabelle/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
       sha256 = "1awgg39i72pivwfijdwffvil3glnpimjz2x04qbl5la2j6la48nb";
     }
     else fetchurl {
-      url = "http://isabelle.in.tum.de/website-${dirname}/dist/${dirname}_linux.tar.gz";
+      url = "https://isabelle.in.tum.de/website-${dirname}/dist/${dirname}_linux.tar.gz";
       sha256 = "01v1zrajyfamjq5b8v18qr3ffivjckifsvvx2vs13di6wsnmm9gw";
     };