diff --git a/src/descrambler/descrambler.c b/src/descrambler/descrambler.c
index a0c5ed05..abe4e956 100644
--- a/src/descrambler/descrambler.c
+++ b/src/descrambler/descrambler.c
@@ -432,7 +432,7 @@ descrambler_descramble ( service_t *t,
                                     ((mpegts_service_t *)t)->s_dvb_svcname);
             if (key_late(dr, ki)) {
               if (ecm_reset(t, dr)) {
-                sbuf_cut(&dr->dr_buf, tsb2 - tsb);
+                sbuf_cut(&dr->dr_buf, tsb2 - dr->dr_buf.sb_data);
                 flush_data = 1;
                 goto next;
               }