diff -Naur lammps-31Oct09/src/fix_rigid.cpp lammps-1Nov09/src/fix_rigid.cpp
--- lammps-31Oct09/src/fix_rigid.cpp	2009-10-30 10:44:26.000000000 -0600
+++ lammps-1Nov09/src/fix_rigid.cpp	2009-10-30 13:40:46.000000000 -0600
@@ -226,7 +226,7 @@
       if (strcmp(arg[iarg+2],"off") == 0) xflag = 0.0;
       else if (strcmp(arg[iarg+2],"on") == 0) xflag = 1.0;
       else error->all("Illegal fix rigid command");
-      if (strcmp(arg[iarg+2],"off") == 0) yflag = 0.0;
+      if (strcmp(arg[iarg+3],"off") == 0) yflag = 0.0;
       else if (strcmp(arg[iarg+3],"on") == 0) yflag = 1.0;
       else error->all("Illegal fix rigid command");
       if (strcmp(arg[iarg+4],"off") == 0) zflag = 0.0;