diff --git a/redo-sh.do b/redo-sh.do
index 468ddde..52f0120 100644
--- a/redo-sh.do
+++ b/redo-sh.do
@@ -12,7 +12,7 @@ WARN=
 # pass the tests, because weaker shells are more likely to point out when you
 # use some non-portable feature.
 for sh in dash /usr/xpg4/bin/sh ash posh mksh ksh ksh88 ksh93 pdksh \
-		zsh bash busybox sh; do
+		zsh bash busybox /bin/sh; do
 	printf "%-30s" "Testing $sh..."
 	FOUND=`which $sh 2>/dev/null` || { echo "missing"; continue; }