diff --git a/nix/sources.json b/nix/sources.json
index 655e714b..41b5a7a2 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -95,6 +95,12 @@
         "url": "https://github.com/obsidiansystems/obelisk/archive/4f2d3f1c1312d833ae814b7a86cf7b65ea0614ec.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "kassandra": {
+        "ref": "master",
+        "repo": "https://git.darmstadt.ccc.de/maralorn/kassandra",
+        "rev": "8abb3558ac2253733cdc53d973ce283846f38984",
+        "type": "git"
+    },
     "unstable": {
         "branch": "nixos-unstable",
         "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
diff --git a/overlays/kassandra/default.nix b/overlays/kassandra/default.nix
index abb7cfdc..2bb04c1b 100644
--- a/overlays/kassandra/default.nix
+++ b/overlays/kassandra/default.nix
@@ -4,14 +4,9 @@ self: super: {
       rustPlatform.buildRustPackage {
         pname = "kassandra";
         version = "no-version";
-        src = fetchgit {
-          url = "git@hera.m-0.eu:kassandra";
-          fetchSubmodules = true;
-          sha256 = "0000000000000000000000000000000000000000000000000000000000000000";
-        };
+        src = super.sources.kassandra;
         nativeBuildInputs = [ pkgconfig ];
         buildInputs = [ openssl ];
-        cargoSha256 = "1ilpw4pzm8fqim29jzwlfgz1jyblragalm50vqyj1n11piapxzlk";
-        CARGO_NET_GIT_FETCH_WITH_CLI = true;
+        cargoSha256 = "0aqyaz4kzp93l8mzqjgcnamh0xyhv4g3rv3dfvlkd2w55bz9fmj5";
       }) { };
 }