diff --git a/tools/regression/bin/sh/expansion/cmdsubst4.0 b/tools/regression/bin/sh/expansion/cmdsubst4.0
new file mode 100644
index 00000000000..ee1ce73e7e3
--- /dev/null
+++ b/tools/regression/bin/sh/expansion/cmdsubst4.0
@@ -0,0 +1,4 @@
+# $FreeBSD$
+
+exec 2>/dev/null
+! y=$(: </var/empty/nonexistent)