diff --git a/sdk_container/src/third_party/portage-stable/metadata/layout.conf b/sdk_container/src/third_party/portage-stable/metadata/layout.conf
index 328d9262e9..854b0beda8 100644
--- a/sdk_container/src/third_party/portage-stable/metadata/layout.conf
+++ b/sdk_container/src/third_party/portage-stable/metadata/layout.conf
@@ -1,2 +1,3 @@
 masters = gentoo portage-stable chromiumos
 use-manifests = true
+thin-manifest = true