diff --git a/include/rexy/buffer.tpp b/include/rexy/buffer.tpp
index ae0e96e..31f14da 100644
--- a/include/rexy/buffer.tpp
+++ b/include/rexy/buffer.tpp
@@ -208,6 +208,7 @@ namespace rexy{
 		for(size_type i = 0;i < len;++i){
 			new (m_data + (m_size + i)) T(p[i]);
 		}
+		m_size += len;
 	}
 
 }