diff --git a/tests/cases/conformance/es6/modules/defaultExportsCannotMerge04.ts b/tests/cases/conformance/es6/modules/defaultExportsCannotMerge04.ts
new file mode 100644
index 00000000000..ab72d10504a
--- /dev/null
+++ b/tests/cases/conformance/es6/modules/defaultExportsCannotMerge04.ts
@@ -0,0 +1,15 @@
+// @module: commonjs
+// @target: ES5
+
+export default function Foo() {
+}
+
+namespace Foo {
+    export var x;
+}
+
+interface Foo {
+}
+
+export interface Foo {
+}
\ No newline at end of file