Index: graphspell/ibdawg.py
==================================================================
--- graphspell/ibdawg.py
+++ graphspell/ibdawg.py
@@ -134,11 +134,11 @@
             self._getArcs = self._getArcs3
             self._writeNodes = self._writeNodes3
         else:
             raise ValueError("  # Error: unknown code: {}".format(self.nCompressionMethod))
 
-        self.bAcronymValid = True
+        self.bAcronymValid = False
         self.bNumAtLastValid = False
 
     def _initBinary (self):
         "initialize with binary structure file"
         if self.by[0:17] != b"/grammalecte-fsa/":