diff --git a/pinos/client/buffer.h b/pinos/client/buffer.h
index eb1656964..3750c780e 100644
--- a/pinos/client/buffer.h
+++ b/pinos/client/buffer.h
@@ -45,6 +45,7 @@ typedef enum {
 } PinosBufferFlags;
 
 struct _PinosBuffer {
+  PinosBuffer *next;
   /*< private >*/
   gsize x[16];
 };
diff --git a/pinos/client/private.h b/pinos/client/private.h
index b3456f3cc..f3c2a6209 100644
--- a/pinos/client/private.h
+++ b/pinos/client/private.h
@@ -62,6 +62,7 @@ typedef struct {
 } PinosStackHeader;
 
 typedef struct {
+  PinosBuffer *next;
   gpointer data;
   gsize size;
   gsize max_size;