Index: generic/nsfShadow.c
===================================================================
diff -u -r92ab630ebd3c1b907e3d0fdf97cc07914245c028 -rdb831678bc92ce4e39bf4ff303f32491a3c4f9d9
--- generic/nsfShadow.c	(.../nsfShadow.c)	(revision 92ab630ebd3c1b907e3d0fdf97cc07914245c028)
+++ generic/nsfShadow.c	(.../nsfShadow.c)	(revision db831678bc92ce4e39bf4ff303f32491a3c4f9d9)
@@ -406,7 +406,7 @@
 #endif
     rc |= NsfReplaceCommand(interp, NSF_FORMAT,     NULL, initialized);
     rc |= NsfReplaceCommand(interp, NSF_INTERP,     NULL, initialized);
-    rc |= NsfReplaceCommand(interp, NSF_IS,         NULL, initialized);
+    rc |= NsfReplaceCommand(interp, NSF_STRING_IS,  NULL, initialized);
 
     /* for the following commands, we have to add our own semantics */
     rc |= NsfReplaceCommand(interp, NSF_INFO_BODY,  Nsf_InfoBodyObjCmd, initialized);