diff --git a/Tethering/proguard.flags b/Tethering/proguard.flags
index 109bbda..47e2848 100644
--- a/Tethering/proguard.flags
+++ b/Tethering/proguard.flags
@@ -15,6 +15,10 @@
     native <methods>;
 }
 
+-keep class com.android.networkstack.tethering.util.TetheringUtils {
+    native <methods>;
+}
+
 # Ensure runtime-visible field annotations are kept when using R8 full mode.
 -keepattributes RuntimeVisibleAnnotations,AnnotationDefault
 -keep interface com.android.networkstack.tethering.util.Struct$Field {