diff --git a/tests/cases/conformance/ambient/ambientDeclarationsPatterns_merging3.ts b/tests/cases/conformance/ambient/ambientDeclarationsPatterns_merging3.ts
new file mode 100644
index 00000000000..85232eca220
--- /dev/null
+++ b/tests/cases/conformance/ambient/ambientDeclarationsPatterns_merging3.ts
@@ -0,0 +1,12 @@
+// @filename: types.ts
+declare module "*.foo" {
+  export interface OhNo { star: string }
+}
+
+// @filename: test.ts
+declare module "a.foo" {
+  export interface OhNo { a: string }
+}
+import { OhNo } from "b.foo"
+declare let ohno: OhNo;
+ohno.a // oh no