diff --git a/default.nix b/default.nix
index bd90606..a1da823 100644
--- a/default.nix
+++ b/default.nix
@@ -6,6 +6,8 @@
 let
   inherit (pkgs) lib mkShell;
 
+  inherit (pkgs.lib.fileset) gitTracked toSource;
+
   git-checks = (import sources.git-hooks).run {
     src = ./.;
 
@@ -39,14 +41,18 @@ in
   };
 
   install =
-    config:
+    { src, ... }@config:
     let
       project = lib.evalModules {
         modules = [
           ./modules
           {
-            config = config // {
+            config = (removeAttrs config [ "src" ]) // {
               _module.args.pkgs = pkgs;
+              rootSrc = toSource {
+                root = src;
+                fileset = gitTracked src;
+              };
             };
           }
         ];
diff --git a/modules/workflows.nix b/modules/workflows.nix
index 481795a..ef90a30 100644
--- a/modules/workflows.nix
+++ b/modules/workflows.nix
@@ -21,6 +21,7 @@ let
     attrsOf
     bool
     enum
+    path
     str
     ;
 
@@ -49,7 +50,7 @@ let
           json2yaml "$valuePath" "$out"
 
           # Check that the workflow is valid
-          action-validator "$out"
+          cd "${cfg.rootSrc}" && action-validator "$out"
         ''
     ) { };
 
@@ -104,6 +105,13 @@ in
         Whether to remove unknown workflow files.
       '';
     };
+
+    rootSrc = mkOption {
+      type = path;
+      description = ''
+        The source of the project.
+      '';
+    };
   };
 
   config = {