diff --git a/contexthub/1.2/Android.bp b/contexthub/1.2/Android.bp
index e819482..9722a97 100644
--- a/contexthub/1.2/Android.bp
+++ b/contexthub/1.2/Android.bp
@@ -6,6 +6,7 @@
     srcs: [
         "types.hal",
         "IContexthub.hal",
+        "IContexthubCallback.hal",
     ],
     interfaces: [
         "android.hardware.contexthub@1.0",