diff --git a/protocol/src/main/resources/cs/Buffer/ByteBuffer.cs b/protocol/src/main/resources/cs/Buffer/ByteBuffer.cs
index faf82c58..cfd6f428 100644
--- a/protocol/src/main/resources/cs/Buffer/ByteBuffer.cs
+++ b/protocol/src/main/resources/cs/Buffer/ByteBuffer.cs
@@ -58,7 +58,7 @@ namespace CsProtocol.Buffer
 
         public void SetWriteOffset(int writeIndex)
         {
-            if (writeOffset > buffer.Length)
+            if (writeIndex > buffer.Length)
             {
                 throw new Exception("writeIndex[" + writeIndex + "] out of bounds exception: readerIndex: " + readOffset +
                                     ", writerIndex: " + writeOffset +
diff --git a/protocol/src/test/resources/csTest/CsProtocol/Buffer/ByteBuffer.cs b/protocol/src/test/resources/csTest/CsProtocol/Buffer/ByteBuffer.cs
index a86da2ef..0a1257ac 100644
--- a/protocol/src/test/resources/csTest/CsProtocol/Buffer/ByteBuffer.cs
+++ b/protocol/src/test/resources/csTest/CsProtocol/Buffer/ByteBuffer.cs
@@ -56,7 +56,7 @@ namespace CsProtocol.Buffer
 
         public void SetWriteOffset(int writeIndex)
         {
-            if (writeOffset > buffer.Length)
+            if (writeIndex > buffer.Length)
             {
                 throw new Exception("writeIndex[" + writeIndex + "] out of bounds exception: readerIndex: " + readOffset +
                                     ", writerIndex: " + writeOffset +