diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index a14a6239d8..40430f8b6b 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -491,7 +491,7 @@ static int write_manifest(AVFormatContext *s, int final)
         }
     }
     avio_printf(out, "\tminBufferTime=\"");
-    write_time(out, c->last_duration);
+    write_time(out, c->last_duration * 2);
     avio_printf(out, "\">\n");
     avio_printf(out, "\t<ProgramInformation>\n");
     if (title) {