diff --git a/test/SemaTemplate/nested-template.cpp b/test/SemaTemplate/nested-template.cpp
index 5ee2c99..4d94818 100644
--- a/test/SemaTemplate/nested-template.cpp
+++ b/test/SemaTemplate/nested-template.cpp
@@ -101,3 +101,10 @@
   template<typename U>
   void f(U u = T()) { }
 };
+
+// PR5103
+template<typename>
+struct X1 {
+  template<typename, bool = false> struct B { };
+};
+template struct X1<int>::B<bool>;