diff --git a/cas/1.0/default/Android.bp b/cas/1.0/default/Android.bp
index 544162b..6da5cc4 100644
--- a/cas/1.0/default/Android.bp
+++ b/cas/1.0/default/Android.bp
@@ -12,6 +12,12 @@
       "TypeConvert.cpp",
     ],
 
+    product_variables: {
+        treble: {
+            cflags: ["-DUSE_VNDBINDER"],
+        },
+    },
+
     compile_multilib: "32",
     init_rc: ["android.hardware.cas@1.0-service.rc"],