Index: graphspell/dawg.py
==================================================================
--- graphspell/dawg.py
+++ graphspell/dawg.py
@@ -157,10 +157,16 @@
         elif cStemming == "S":
             self.funcStemming = st.changeWordWithSuffixCode
         else:
             self.funcStemming = st.noStemming
 
+        # calculated later
+        self.nBytesNodeAddress = 1
+        self.nBytesArc = 0
+        self.nBytesOffset = 0
+        self.nMaxOffset = 0
+
         # build
         lWord.sort()
         oProgBar = ProgressBar(0, len(lWord))
         for aEntry in lWord:
             self.insert(aEntry)