diff --git a/include/common/buffer.h b/include/common/buffer.h
index a42fc25..4e19c22 100644
--- a/include/common/buffer.h
+++ b/include/common/buffer.h
@@ -33,7 +33,7 @@
 #include <haproxy/istbuf.h>
 #include <haproxy/pool.h>
 
-#include <proto/activity.h>
+#include <haproxy/activity.h>
 
 /* an element of the <buffer_wq> list. It represents an object that need to
  * acquire a buffer to continue its process. */