diff --git a/src/main/kotlin/cn/tursom/core/buffer/ByteBuffer.kt b/src/main/kotlin/cn/tursom/core/buffer/ByteBuffer.kt
index 11ba9ff..d9818e9 100644
--- a/src/main/kotlin/cn/tursom/core/buffer/ByteBuffer.kt
+++ b/src/main/kotlin/cn/tursom/core/buffer/ByteBuffer.kt
@@ -37,7 +37,7 @@ interface ByteBuffer : Closeable {
   }
 
   val readable: Int get() = writePosition - readPosition
-  val writeable: Int get() = capacity - readPosition
+  val writeable: Int get() = capacity - writePosition
 
   val hasArray: Boolean
   val array: ByteArray