1 files changed, 1 insertions, 1 deletions
diff --git a/perl.c b/perl.c
index 701b010484..130a83c6ec 100644
--- a/perl.c
+++ b/perl.c
@@ -1923,7 +1923,7 @@ S_parse_body(pTHX_ char **env, XSINIT_t xsinit)
 		d = s;
 		if (!*s)
 		    break;
-		if (!strchr("CDIMUdmtw", *s))
+		if (!strchr("CDIMUdmtwW", *s))
 		    Perl_croak(aTHX_ "Illegal switch in PERL5OPT: -%c", *s);
 		while (++s && *s) {
 		    if (isSPACE(*s)) {