diff --git a/tools/build_site.py b/tools/build_site.py
index 46de93f..8c5f9e3 100644
--- a/tools/build_site.py
+++ b/tools/build_site.py
@@ -150,14 +150,14 @@ def build(
     manifest = load_manifest(manifest_path)
     as_of = as_of or dt.date.today()
     source_root = os.environ.get("POLICY_NEXUS_SOURCE_ROOT")
-    repository_paths = {
-        name: (
-            (Path(source_root) / name).resolve()
-            if source_root
+    repository_paths = {}
+    for name, config in manifest["repositories"].items():
+        fetched = (Path(source_root) / name).resolve() if source_root else None
+        repository_paths[name] = (
+            fetched
+            if fetched is not None and fetched.is_dir()
             else (manifest_path.parent / config["path"]).resolve()
         )
-        for name, config in manifest["repositories"].items()
-    }
     output_parent = output.resolve().parent
     output_parent.mkdir(parents=True, exist_ok=True)
     temporary = Path(tempfile.mkdtemp(prefix=f".{output.name}-", dir=output_parent))