--- a/absyntax/absyntax.cc	Thu Jul 19 13:42:05 2012 +0100
+++ b/absyntax/absyntax.cc	Fri Jul 20 15:50:49 2012 +0100
@@ -57,10 +57,10 @@
   this->last_column  = last_column;
   this->last_order   = last_order;
   this->datatype     = NULL;
-  this->const_value_real64   = NULL;
-  this->const_value_int64    = NULL;
-  this->const_value_uint64   = NULL;
-  this->const_value_bool     = NULL;
+  this->const_value._real64.status   = cs_undefined;
+  this->const_value._int64.status    = cs_undefined;
+  this->const_value._uint64.status   = cs_undefined;
+  this->const_value._bool.status     = cs_undefined;
 }