--- a/src/variables.cc
+++ b/src/variables.cc
@@ -126,14 +126,14 @@
   sym_rec->unprotect ();
 
   Mapper_fcn mfcn;
-  mfcn.neg_arg_complex = mf->neg_arg_complex;
+  mfcn.can_return_complex_for_real_arg = mf->can_return_complex_for_real_arg;
+  mfcn.lower_limit = mf->lower_limit;
+  mfcn.upper_limit = mf->upper_limit;
   mfcn.d_d_mapper = mf->d_d_mapper;
   mfcn.d_c_mapper = mf->d_c_mapper;
   mfcn.c_c_mapper = mf->c_c_mapper;
 
-  tree_builtin *def = new tree_builtin (mf->nargin_max,
-					mf->nargout_max, mfcn,
-					mf->name);
+  tree_builtin *def = new tree_builtin (2, 1, mfcn, mf->name);
 
   sym_rec->define (def);