diff --git a/libmpdemux/demux_smjpeg.c b/libmpdemux/demux_smjpeg.c
index 67a40ba35c..03be3f3bd6 100644
--- a/libmpdemux/demux_smjpeg.c
+++ b/libmpdemux/demux_smjpeg.c
@@ -24,7 +24,7 @@
 
 int smjpeg_check_file(demuxer_t* demuxer){
     int orig_pos = stream_tell(demuxer->stream);
-    char buf[7];
+    char buf[8];
     int version;
     
     mp_msg(MSGT_DEMUX, MSGL_V, "Checking for SMJPEG\n");