diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index d540126172..3a5cb769ba 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -2603,7 +2603,8 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
                     FFSWAP(struct Program, ts->prg[nb_prg], ts->prg[prg_idx]);
                 if (prg_idx >= nb_prg)
                     nb_prg++;
-            }
+            } else
+                nb_prg = 0;
         }
     }
     ts->nb_prg = nb_prg;