diff --git a/bbl/bbl.c b/bbl/bbl.c
index eb061f9..220e447 100644
--- a/bbl/bbl.c
+++ b/bbl/bbl.c
@@ -1,7 +1,7 @@
 /*
  * bbl.c - Produce a "Knight Rider" effect on the LED board
  *
- * Written 2010 by Werner Almesberger <werner@openmoko.org>
+ * Written 2010-2011 by Werner Almesberger <werner@openmoko.org>
  *  
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -98,7 +98,7 @@ int main(int argc, char **argv)
 {
 	int fd, i;
 
-	fd = open("/dev/mem", O_RDWR);
+	fd = open("/dev/mem", O_RDWR | O_SYNC);
         if (fd < 0) {
 		perror("/dev/mem");
 		exit(1);