diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java b/codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java
index 91d3e7c5fd..50e9680628 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/multipart/AbstractMemoryHttpData.java
@@ -209,7 +209,7 @@ public abstract class AbstractMemoryHttpData extends AbstractHttpData {
         if (sizeLeft < length) {
             sliceLength = sizeLeft;
         }
-        ByteBuf chunk = byteBuf.slice(chunkPosition, sliceLength);
+        ByteBuf chunk = byteBuf.slice(chunkPosition, sliceLength).retain();
         chunkPosition += sliceLength;
         return chunk;
     }