Index: generic/nsfError.c
===================================================================
diff -u -r8eecbe5b3a2640ba1d3e1dc6dc5e9cec0c2a26ba -rb8fe2d48d0baf637e303b5d32f00ee948a8bfbe6
--- generic/nsfError.c	(.../nsfError.c)	(revision 8eecbe5b3a2640ba1d3e1dc6dc5e9cec0c2a26ba)
+++ generic/nsfError.c	(.../nsfError.c)	(revision b8fe2d48d0baf637e303b5d32f00ee948a8bfbe6)
@@ -250,7 +250,7 @@
   NsfDStringVPrintf(&ds, fmt, ap);
   va_end(ap);
 
-  Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_DStringValue(&ds), -1));
+  Tcl_SetObjResult(interp, Tcl_NewStringObj(Tcl_DStringValue(&ds), Tcl_DStringLength(&ds)));
   Tcl_DStringFree(&ds);
 
   return TCL_ERROR;