diff --git a/service/native/libs/libclat/clatutils.cpp b/service/native/libs/libclat/clatutils.cpp
index be86612..64e5b91 100644
--- a/service/native/libs/libclat/clatutils.cpp
+++ b/service/native/libs/libclat/clatutils.cpp
@@ -29,10 +29,6 @@
 #include "checksum.h"
 }
 
-// Sync from external/android-clat/clatd.h
-#define MAXMTU 65536
-#define PACKETLEN (MAXMTU + sizeof(struct tun_pi))
-
 // Sync from system/netd/include/netid_client.h.
 #define MARK_UNSET 0u
 
@@ -235,7 +231,7 @@
     // Compare it against the first four bytes of our IPv6 address, in host byte order (BPF loads
     // are always in host byte order). If it matches, continue with next instruction (JMP 0). If it
     // doesn't match, jump ahead to statement that returns 0 (ignore packet). Repeat for the other
-    // three words of the IPv6 address, and if they all match, return PACKETLEN (accept packet).
+    // three words of the IPv6 address, and if they all match, return full packet (accept packet).
         BPF_STMT(BPF_LD  | BPF_W   | BPF_ABS,  24),
         BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,    htonl(ipv6[0]), 0, 7),
         BPF_STMT(BPF_LD  | BPF_W   | BPF_ABS,  28),
@@ -244,7 +240,7 @@
         BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,    htonl(ipv6[2]), 0, 3),
         BPF_STMT(BPF_LD  | BPF_W   | BPF_ABS,  36),
         BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,    htonl(ipv6[3]), 0, 1),
-        BPF_STMT(BPF_RET | BPF_K,              PACKETLEN),
+        BPF_STMT(BPF_RET | BPF_K,              0xFFFFFFFF),
         BPF_STMT(BPF_RET | BPF_K,              0),
     };
     // clang-format on