diff --git a/decocare/history.py b/decocare/history.py
index ab6aec9..f1c21eb 100644
--- a/decocare/history.py
+++ b/decocare/history.py
@@ -796,7 +796,7 @@ def clean (self, data):
     # data.reverse( )
     # self.data = self.eat_nulls(data)
     #self.data.reverse( )
-    self.data = data[:]
+    self.data = data[0:1022]
     # XXX: under some circumstances, zero is the correct value and
     # eat_nulls actually eats valid data.  This ugly hack restores two
     # nulls back ot the end.