diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index b449e72..ac1fd55 100755
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -7919,7 +7919,8 @@
         return captivePortalBuilder.build();
     }
 
-    private String makeNflogPrefix(String iface, long networkHandle) {
+    @VisibleForTesting
+    static String makeNflogPrefix(String iface, long networkHandle) {
         // This needs to be kept in sync and backwards compatible with the decoding logic in
         // NetdEventListenerService, which is non-mainline code.
         return SdkLevel.isAtLeastU() ? (networkHandle + ":" + iface) : ("iface:" + iface);