diff --git a/include/common/buffer.h b/include/common/buffer.h
index b299466..ada43d9 100644
--- a/include/common/buffer.h
+++ b/include/common/buffer.h
@@ -96,12 +96,21 @@
  * The caller is responsible for ensuring that <del> is always smaller than or
  * equal to b->i.
  */
-static inline void b_del(struct buffer *b, unsigned int del)
+static inline void bi_del(struct buffer *b, unsigned int del)
 {
 	b->i -= del;
 	b->p = b_ptr(b, del);
 }
 
+/* Skips <del> bytes from the output of buffer <b> by simply shrinking <o>.
+ * The caller is responsible for ensuring that <del> is always smaller than or
+ * equal to b->o.
+ */
+static inline void bo_del(struct buffer *b, unsigned int del)
+{
+	b->o -= del;
+}
+
 /* Advances the buffer by <adv> bytes, which means that the buffer
  * pointer advances, and that as many bytes from in are transferred
  * to out. The caller is responsible for ensuring that adv is always