diff --git a/pkgs/tools/networking/vpnc/default.nix b/pkgs/tools/networking/vpnc/default.nix
index 86e483114a39..6a23c81569f0 100644
--- a/pkgs/tools/networking/vpnc/default.nix
+++ b/pkgs/tools/networking/vpnc/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation rec {
   name = "vpnc-0.5.3-post-r550";
   src = fetchsvn {
-    url = "http://svn.unix-ag.uni-kl.de/vpnc";
+    url = "https://svn.unix-ag.uni-kl.de/vpnc";
     rev = "550";
     sha256 = "0x4ckfv9lpykwmh28v1kyzz91y1j2v48fi8q5nsawrba4q0wlrls";
   };