@@ -1073,11 +1073,11 @@
 		OFFreeMemory(_writeBuffer);
 		_writeBuffer = NULL;
 		_writeBufferLength = 0;
 	}
 
-	OFEnsure(bytesWritten < _writeBufferLength);
+	OFEnsure(bytesWritten <= _writeBufferLength);
 
 	memmove(_writeBuffer, _writeBuffer + bytesWritten,
 	    _writeBufferLength - bytesWritten);
 	_writeBufferLength -= bytesWritten;
 	@try {