diff --git a/qse/regress/awk/regress.sh b/qse/regress/awk/regress.sh
index 05911f86..a010fe89 100755
--- a/qse/regress/awk/regress.sh
+++ b/qse/regress/awk/regress.sh
@@ -237,7 +237,7 @@ test)
 	;;
 leakcheck)
 	bin_valgrind="`which valgrind 2> /dev/null || echo ""`"
-	[ -z "${bin_valgrind}" ] && {
+	[ -n "${bin_valgrind}" -a -f "${bin_valgrind}" ] || {
 		echo_so "valgrind not found. cannot perform this test"
 		exit 1
 	}
diff --git a/qse/regress/sed/regress.sh b/qse/regress/sed/regress.sh
index 6d21685c..8c4f57ea 100755
--- a/qse/regress/sed/regress.sh
+++ b/qse/regress/sed/regress.sh
@@ -117,7 +117,7 @@ test)
 	;;
 leakcheck)
 	bin_valgrind="`which valgrind 2> /dev/null || echo ""`"
-	[ -z "${bin_valgrind}" ] && {
+	[ -n "${bin_valgrind}" -a -f "${bin_valgrind}" ] || {
 		echo_so "valgrind not found. cannot perform this test"
 		exit 1
 	}