diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index d089bf6..e8b038b 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -68,6 +68,7 @@
         "PixelFormat.cpp",
         "Rect.cpp",
         "Region.cpp",
+        "Size.cpp",
         "Transform.cpp",
         "UiConfig.cpp",
     ],