diff --git a/service/native/TrafficController.cpp b/service/native/TrafficController.cpp
index 97fcc43..51dd502 100644
--- a/service/native/TrafficController.cpp
+++ b/service/native/TrafficController.cpp
@@ -683,8 +683,6 @@
     }
 }
 
-const String16 TrafficController::DUMP_KEYWORD = String16("trafficcontroller");
-
 void TrafficController::dump(DumpWriter& dw, bool verbose) {
     std::lock_guard guard(mMutex);
     ScopedIndent indentTop(dw);
diff --git a/service/native/include/TrafficController.h b/service/native/include/TrafficController.h
index c050871..ddcf445 100644
--- a/service/native/include/TrafficController.h
+++ b/service/native/include/TrafficController.h
@@ -25,7 +25,6 @@
 #include "netdutils/DumpWriter.h"
 #include "netdutils/NetlinkListener.h"
 #include "netdutils/StatusOr.h"
-#include "utils/String16.h"
 
 namespace android {
 namespace net {
@@ -34,6 +33,8 @@
 
 class TrafficController {
   public:
+    static constexpr char DUMP_KEYWORD[] = "trafficcontroller";
+
     /*
      * Initialize the whole controller
      */
@@ -84,7 +85,6 @@
 
     netdutils::Status updateUidOwnerMap(const uint32_t uid,
                                         UidOwnerMatchType matchType, IptOp op) EXCLUDES(mMutex);
-    static const String16 DUMP_KEYWORD;
 
     int toggleUidOwnerMap(ChildChain chain, bool enable) EXCLUDES(mMutex);