Index: mttroot/mtt/lib/cc/mtt_dassl.cc
==================================================================
--- mttroot/mtt/lib/cc/mtt_dassl.cc
+++ mttroot/mtt/lib/cc/mtt_dassl.cc
@@ -63,11 +63,11 @@
 
   static DAEFunc fdae(mtt_residual);
   static ColumnVector XX (Nx+Nyz);
   XX.insert (x,0);
 
-  for (register int i = Nx; i < Nyz; i++)
+  for (register int i = Nx; i < Nx+Nyz; i++)
     XX(i) = 0.0;
 
   double tout = t + ddt;
 
   DASSL fdassl (XX, t, fdae);