diff --git a/codec-memcache/src/test/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoderTest.java b/codec-memcache/src/test/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoderTest.java
index cb255f6943..79c5ad671b 100644
--- a/codec-memcache/src/test/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoderTest.java
+++ b/codec-memcache/src/test/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoderTest.java
@@ -136,6 +136,8 @@ public class BinaryMemcacheEncoderTest {
 
         ByteBuf written = channel.readOutbound();
         assertThat(written.readableBytes(), is(DEFAULT_HEADER_SIZE));
+        written.release();
+
         written = channel.readOutbound();
         assertThat(written.readableBytes(), is(content1.content().readableBytes()));
         assertThat(