diff --git a/aio-pro/src/main/java/org/smartboot/socket/extension/decoder/DelimiterFrameDecoder.java b/aio-pro/src/main/java/org/smartboot/socket/extension/decoder/DelimiterFrameDecoder.java
index 3efd15d9c2aa740ead6d22070429dd83ba7fbdab..0f066a33bec20a1e6a1808dadc1fc74f416c2253 100644
--- a/aio-pro/src/main/java/org/smartboot/socket/extension/decoder/DelimiterFrameDecoder.java
+++ b/aio-pro/src/main/java/org/smartboot/socket/extension/decoder/DelimiterFrameDecoder.java
@@ -67,7 +67,7 @@ public class DelimiterFrameDecoder implements SmartDecoder {
                     preBuffer = bufferList.get(position);
                     preBuffer.clear();
                 } else {
-                    preBuffer = ByteBuffer.allocate(preBuffer.capacity());
+                    preBuffer = ByteBuffer.allocate(byteBuffer.capacity());
                     bufferList.add(preBuffer);
                 }
             }