diff --git a/Makefile b/Makefile
index c109694..057a5f5 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ frfac:
 check:
 	`./latest_perl` -wc frfac.in
 	perlcritic frfac.in
-	if which ksh93 2> /dev/null; then \
+	if which ksh93 > /dev/null 2>&1; then \
 		ksh93 -n getviaphone; \
 	else \
 		ksh -n getviaphone; \