diff --git a/tools/regression/bin/sh/execution/bg4.0 b/tools/regression/bin/sh/execution/bg4.0
new file mode 100644
index 00000000000..25e4f4e34fa
--- /dev/null
+++ b/tools/regression/bin/sh/execution/bg4.0
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+x=''
+: ${x:=1} &
+wait
+exit ${x:-0}