Add missing virtual qualifier to ~io_buffer_t

1 files changed, 1 insertions, 1 deletions

diff --git a/io.h b/io.h
index 0c39963f..30d0dfe2 100644
--- a/io.h
+++ b/io.h
@@ -128,7 +128,7 @@ private:
 public:
     virtual void print() const;
 
-    ~io_buffer_t();
+    virtual ~io_buffer_t();
 
     /** Function to create the output buffer */
     void out_buffer_create()