diff --git a/testsuite/sed/sed-recurses-properly b/testsuite/sed/sed-recurses-properly
new file mode 100644
index 000000000..32101008f
--- /dev/null
+++ b/testsuite/sed/sed-recurses-properly
@@ -0,0 +1 @@
+test "$(echo '12345' | busybox sed -e 's/[[:space:]]*/,/g')" = ',1,2,3,4,5,'