diff --git a/src/backend.c b/src/backend.c
index 6a2670a67..8ce981ce0 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -248,8 +248,8 @@ struct server *get_server_ph_post(struct session *s)
 	const char      *params = req->data + msg->sov;
 	const char      *p    = params;
 
-	if (len > req->l - msg->sov)
-		len = req->l - msg->sov;
+	if (len > req->l - (msg->sov - msg->som))
+		len = req->l - (msg->sov - msg->som);
 
 	if (len == 0)
 		return NULL;
diff --git a/src/proto_http.c b/src/proto_http.c
index 3a93360d7..bcb02129e 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2970,7 +2970,7 @@ int http_process_request_body(struct session *s, struct buffer *req, int an_bit)
 	if (msg->hdr_content_len < limit)
 		limit = msg->hdr_content_len;
 
-	if (req->l - msg->sov >= limit)    /* we have enough bytes now */
+	if (req->l - (msg->sov - msg->som) >= limit)    /* we have enough bytes now */
 		goto http_end;
 
  missing_data: