diff --git a/doc/src/Developer_write.rst b/doc/src/Developer_write.rst
index bdb51540c7..bdc6559060 100644
--- a/doc/src/Developer_write.rst
+++ b/doc/src/Developer_write.rst
@@ -55,7 +55,7 @@ of each timestep. First of all, implement a constructor:
      if (narg < 4)
        error->all(FLERR,"Illegal fix print/vel command");
 
-     nevery = utils::inumeric(FLERR,arg[3]);
+     nevery = utils::inumeric(FLERR,arg[3],false,lmp);
      if (nevery <= 0)
        error->all(FLERR,"Illegal fix print/vel command");
    }