diff --git a/base/src/main/java/io/vproxy/base/util/unsafe/SunUnsafe.java b/base/src/main/java/io/vproxy/base/util/unsafe/SunUnsafe.java
index 790b26ff..a5bb3d4b 100644
--- a/base/src/main/java/io/vproxy/base/util/unsafe/SunUnsafe.java
+++ b/base/src/main/java/io/vproxy/base/util/unsafe/SunUnsafe.java
@@ -32,8 +32,4 @@ public static MemorySegment allocateMemory(long size) {
     public static void freeMemory(long address) {
         U.freeMemory(address);
     }
-
-    public static void copyMemory(long dst, long src, int len) {
-        U.copyMemory(src, dst, len);
-    }
 }
diff --git a/test/src/test/java/io/vproxy/poc/XDPPoc.java b/test/src/test/java/io/vproxy/poc/XDPPoc.java
index a25fb159..7d119746 100644
--- a/test/src/test/java/io/vproxy/poc/XDPPoc.java
+++ b/test/src/test/java/io/vproxy/poc/XDPPoc.java
@@ -7,7 +7,6 @@
 import io.vproxy.base.util.Consts;
 import io.vproxy.base.util.LogType;
 import io.vproxy.base.util.Logger;
-import io.vproxy.base.util.unsafe.SunUnsafe;
 import io.vproxy.vfd.EventSet;
 import io.vproxy.vpacket.*;
 import io.vproxy.xdp.*;
@@ -102,10 +101,8 @@ private void handleReadable() {
 
                         Logger.alert("new chunk: " + chunk2);
 
-                        SunUnsafe.copyMemory(
-                            umem.getBufferAddress() + chunk2.pktaddr,
-                            umem.getBufferAddress() + chunk.pktaddr,
-                            chunk.pktlen);
+                        umemSeg.asSlice(chunk2.pktaddr, chunk.pktlen)
+                            .copyFrom(umemSeg.asSlice(chunk.pktaddr, chunk.pktlen));
                         xsk.writePacket(chunk2);
                     }