diff --git a/root.bp b/root.bp
index d1e8e3eb9..219b4e503 100644
--- a/root.bp
+++ b/root.bp
@@ -20,6 +20,7 @@ optional_subdirs = [
     "frameworks/av",
     "frameworks/base",
     "frameworks/compile/*",
+    "frameworks/hardware/interfaces",
     "frameworks/native",
     "frameworks/rs",
     "frameworks/wilhelm",
@@ -30,6 +31,7 @@ optional_subdirs = [
     "prebuilts/ndk",
     "prebuilts/sdk",
     "system/*",
+    "system/hardware/interfaces",
     "system/tools/*",
     "test/vts",
     "test/vts-testcase/*",