diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index 7abe03c26d..2e0f22f4df 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -323,7 +323,7 @@ static int64_t get_best_effort_duration(ConcatFile *file, AVFormatContext *avf)
     if (file->user_duration != AV_NOPTS_VALUE)
         return file->user_duration;
     if (file->outpoint != AV_NOPTS_VALUE)
-        return file->outpoint - file->file_inpoint;
+        return av_sat_sub64(file->outpoint, file->file_inpoint);
     if (avf->duration > 0)
         return avf->duration - (file->file_inpoint - file->file_start_time);
     if (file->next_dts != AV_NOPTS_VALUE)