diff --git a/src/lib/include/ares__buf.h b/src/lib/include/ares__buf.h
index 855853fa..e1f10adf 100644
--- a/src/lib/include/ares__buf.h
+++ b/src/lib/include/ares__buf.h
@@ -27,6 +27,7 @@
 #define __ARES__BUF_H
 
 #include "ares.h"
+#include "ares__llist.h"
 
 /*! \addtogroup ares__buf Safe Data Builder and buffer
  *