diff --git a/include/proto/channel.h b/include/proto/channel.h
index c7135de01..4e5b90b30 100644
--- a/include/proto/channel.h
+++ b/include/proto/channel.h
@@ -707,9 +707,9 @@ static inline void channel_truncate(struct channel *chn)
  * it allows the largest inputs to be processed at once and ensures that once
  * the output data leaves, the whole buffer is available at once.
  */
-static inline void channel_slow_realign(struct channel *chn)
+static inline void channel_slow_realign(struct channel *chn, char *swap)
 {
-	return buffer_slow_realign(chn->buf, co_data(chn));
+	return b_slow_realign(chn->buf, swap, co_data(chn));
 }
 
 /*
diff --git a/src/hlua.c b/src/hlua.c
index cdb5ff69c..f8170062e 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -3041,7 +3041,7 @@ __LJMP static int hlua_channel_send_yield(lua_State *L, int status, lua_KContext
 	 * detects a non contiguous buffer and realign it.
 	 */
 	if (bi_space_for_replace(chn->buf) < max)
-		channel_slow_realign(chn);
+		channel_slow_realign(chn, trash.str);
 
 	/* Copy input data in the buffer. */
 	max = buffer_replace2(chn->buf, chn->buf->p, chn->buf->p, str + l, max);
diff --git a/src/proto_http.c b/src/proto_http.c
index a4db33a48..67598e58a 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -1652,7 +1652,7 @@ int http_wait_for_request(struct stream *s, struct channel *req, int an_bit)
 			}
 			if (unlikely(bi_end(req->buf) < b_ptr(req->buf, msg->next) ||
 			             bi_end(req->buf) > req->buf->data + req->buf->size - global.tune.maxrewrite))
-				channel_slow_realign(req);
+				channel_slow_realign(req, trash.str);
 		}
 
 		if (likely(msg->next < req->buf->i)) /* some unparsed data are available */
@@ -5139,7 +5139,7 @@ int http_wait_for_response(struct stream *s, struct channel *rep, int an_bit)
 
 		if (unlikely(bi_end(rep->buf) < b_ptr(rep->buf, msg->next) ||
 		             bi_end(rep->buf) > rep->buf->data + rep->buf->size - global.tune.maxrewrite))
-			channel_slow_realign(rep);
+			channel_slow_realign(rep, trash.str);
 
 		if (likely(msg->next < rep->buf->i))
 			http_msg_analyzer(msg, &txn->hdr_idx);
@@ -9517,7 +9517,7 @@ int smp_prefetch_http(struct proxy *px, struct stream *s, unsigned int opt,
 		 */
 		if (s->req.buf->p > s->req.buf->data &&
 		    s->req.buf->i + s->req.buf->p > s->req.buf->data + s->req.buf->size - global.tune.maxrewrite)
-			channel_slow_realign(&s->req);
+			channel_slow_realign(&s->req, trash.str);
 
 		if (unlikely(txn->req.msg_state < HTTP_MSG_BODY)) {
 			if (msg->msg_state == HTTP_MSG_ERROR)