diff --git a/clang/test/Index/index-anonymous-union-fields.cpp b/clang/test/Index/index-anonymous-union-fields.cpp
new file mode 100644
index 0000000..30f254d
--- /dev/null
+++ b/clang/test/Index/index-anonymous-union-fields.cpp
@@ -0,0 +1,10 @@
+struct X {
+  union {
+    void *a;
+  };
+};
+
+// RUN: c-index-test -index-file %s > %t
+// RUN: FileCheck %s -input-file=%t
+
+// CHECK: [indexDeclaration]: kind: field | name: a | {{.*}} | loc: 3:11