diff --git a/include/proto/http_htx.h b/include/proto/http_htx.h
index 9afea5c..7a2e008 100644
--- a/include/proto/http_htx.h
+++ b/include/proto/http_htx.h
@@ -24,10 +24,13 @@
 #define _PROTO_HTTP_HTX_H
 
 #include <common/buf.h>
+#include <common/ist.h>
 
 #include <types/h1.h>
 #include <types/http_htx.h>
 
+extern struct buffer htx_err_chunks[HTTP_ERR_SIZE];
+
 struct htx_sl *http_find_stline(struct htx *htx);
 int http_find_header(const struct htx *htx, const struct ist name, struct http_hdr_ctx *ctx, int full);
 int http_add_header(struct htx *htx, const struct ist n, const struct ist v);
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 7546f01..7394619 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -78,7 +78,7 @@
 void htx_perform_server_redirect(struct stream *s, struct stream_interface *si);
 void htx_server_error(struct stream *s, struct stream_interface *si, int err, int finst, const struct buffer *msg);
 void htx_reply_and_close(struct stream *s, short status, struct buffer *msg);
-
+struct buffer *htx_error_message(struct stream *s);
 
 void debug_hdr(const char *dir, struct stream *s, const char *start, const char *end);
 int apply_filter_to_req_headers(struct stream *s, struct channel *req, struct hdr_exp *exp);