diff --git a/Android.bp b/Android.bp
index 8bcd1aa..b4bf8e0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -94,6 +94,9 @@
 
         "utils/autolock.cpp",
         "utils/hwcutils.cpp",
+
+        "backend/backendmanager.cpp",
+        "backend/backend.cpp",
     ],
 }