diff --git a/spin/packet_driver.spin b/spin/packet_driver.spin
index d06725d..e5e26d7 100644
--- a/spin/packet_driver.spin
+++ b/spin/packet_driver.spin
@@ -75,7 +75,7 @@ PUB startx(mbox, rxpin, txpin, mode, baudrate, rxsiz, txsiz, buffs) : okay
   stopx(mbox)
 
   ' compute the ticks per bit from the baudrate
-  baudrate := clkfreq / baudrate
+  bitticks := clkfreq / baudrate
 
   ' start the driver cog
   okay := long[mbox][4] := cognew(@entry, @mbox) + 1