diff --git a/pymlac/TtyIn.py b/pymlac/TtyIn.py
index dbdb774..0fd9f78 100644
--- a/pymlac/TtyIn.py
+++ b/pymlac/TtyIn.py
@@ -31,6 +31,7 @@ class TtyIn(object):
         self.atEOF = True
         self.cycle_count = 0
         self.status = self.DEVICE_NOT_READY
+        self.offset = 0
 
         log('TTYIN: DEVICE_READY_CYCLES=%d' % self.DEVICE_READY_CYCLES)