diff --git a/include/common/htx.h b/include/common/htx.h
index 55d4931..ec99098 100644
--- a/include/common/htx.h
+++ b/include/common/htx.h
@@ -139,6 +139,9 @@
 
 	/* XXX 2 bytes unused */
 
+	int32_t hdrs_bytes;  /* Bytes held by all headers from this start-line
+			      * to the corresponding EOH. -1 if unknown */
+
 	unsigned int len[3]; /* length of differnt parts of the start-line */
 	char         l[0];
 };