diff --git a/hgext3rd/rust/__init__.py b/hgext3rd/rust/__init__.py
new file mode 100644
--- /dev/null
+++ b/hgext3rd/rust/__init__.py
@@ -0,0 +1,6 @@
+from __future__ import absolute_import
+import pkgutil
+
+# Indicate that hgext3rd.rust is a namspace package, and other python path
+# directories may still be searched for hgext3rd.rust libraries.
+__path__ = pkgutil.extend_path(__path__, __name__)
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -519,6 +519,10 @@
             package='treedirstate',
             manifest='rust/treedirstate/Cargo.toml',
         ),
+        RustExtension('indexes',
+            package='hgext3rd.rust',
+            manifest='rust/indexes/Cargo.toml',
+        ),
     ])
 
 setup(