diff --git a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
index 18d2311..2c56d6c 100644
--- a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
+++ b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
@@ -36,9 +36,6 @@
 #include "libclat/clatutils.h"
 #include "nativehelper/scoped_utf_chars.h"
 
-// Sync from system/netd/include/netid_client.h
-#define MARK_UNSET 0u
-
 // Sync from system/netd/server/NetdConstants.h
 #define __INT_STRLEN(i) sizeof(#i)
 #define _INT_STRLEN(i) __INT_STRLEN(i)
@@ -197,7 +194,7 @@
     }
 
     // TODO: check the mark validation
-    if (mark != MARK_UNSET && setsockopt(sock, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)) < 0) {
+    if (setsockopt(sock, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)) < 0) {
         throwIOException(env, "could not set mark on raw socket", errno);
         close(sock);
         return -1;