diff --git a/hydra-project.json b/hydra-project.json
new file mode 100644
index 0000000..563c0c6
--- /dev/null
+++ b/hydra-project.json
@@ -0,0 +1,19 @@
+{
+    "main": {
+        "enabled": 1,
+        "hidden": false,
+        "description": "js",
+        "nixexprinput": "nixScripts",
+        "nixexprpath": "main.nix",
+        "checkinterval": 300,
+        "schedulingshares": 10,
+        "enableemail": false,
+        "emailoverride": "",
+        "keepnr": 10,
+        "inputs": {
+            "nixScripts": { "type": "git", "value": "git://github.com/m-labs/nix-scripts.git", "emailresponsible": false },
+            "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs-channels nixos-18.09", "emailresponsible": false },
+            "artiqSrc": { "type": "git", "value": "git://github.com/m-labs/artiq.git master 1", "emailresponsible": false }
+        }
+    }
+}
diff --git a/hydra-project.nix b/hydra-project.nix
deleted file mode 100644
index ef8634b..0000000
--- a/hydra-project.nix
+++ /dev/null
@@ -1,27 +0,0 @@
-{ pkgs ? import <nixpkgs> {}}:
-{
-  jobsets = pkgs.runCommand "spec.json" {}
-    ''
-    cat > $out << EOF
-    {
-        "main": {
-            "enabled": 1,
-            "hidden": false,
-            "description": "js",
-            "nixexprinput": "nixScripts",
-            "nixexprpath": "main.nix",
-            "checkinterval": 300,
-            "schedulingshares": 10,
-            "enableemail": false,
-            "emailoverride": "",
-            "keepnr": 10,
-            "inputs": {
-                "nixScripts": { "type": "git", "value": "git://github.com/m-labs/nix-scripts.git", "emailresponsible": false },
-                "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs-channels nixos-18.09", "emailresponsible": false },
-                "artiqSrc": { "type": "git", "value": "git://github.com/m-labs/artiq.git master 1", "emailresponsible": false }
-            }
-        }
-    }
-    EOF
-    '';
-}