diff --git a/packages/CarrierDefaultApp/proguard.flags b/packages/CarrierDefaultApp/proguard.flags
new file mode 100644
index 0000000..64fec2c
--- /dev/null
+++ b/packages/CarrierDefaultApp/proguard.flags
@@ -0,0 +1,4 @@
+# Keep classes and methods that have the @JavascriptInterface annotation
+-keepclassmembers class * {
+    @android.webkit.JavascriptInterface <methods>;
+}