Index: generic/nsf.c
===================================================================
diff -u -r9f51576de17e47b9495ae7ceea1340bc8d200507 -r17b63f15e327dd62f8dcd5e5419b7096b7d858ce
--- generic/nsf.c	(.../nsf.c)	(revision 9f51576de17e47b9495ae7ceea1340bc8d200507)
+++ generic/nsf.c	(.../nsf.c)	(revision 17b63f15e327dd62f8dcd5e5419b7096b7d858ce)
@@ -14414,7 +14414,7 @@
 
     if (objc == 0 && ((pPtr->flags & NSF_ARG_ALLOW_EMPTY) == 0)) {
       return NsfPrintError(interp,
-			   "invalid parameter value for %s: list is not allowed to be empty",
+			   "invalid value for parameter '%s': list is not allowed to be empty",
 			   pPtr->name);
     }