diff --git a/clang/test/Modules/cxx-templates.cpp b/clang/test/Modules/cxx-templates.cpp
index bb8ba03..79052dd 100644
--- a/clang/test/Modules/cxx-templates.cpp
+++ b/clang/test/Modules/cxx-templates.cpp
@@ -51,6 +51,9 @@
   // 'common'. That type is not visible here.
   PerformDelayedLookup(defined_in_common);
 
+  // Likewise, but via a default argument.
+  PerformDelayedLookupInDefaultArgument(defined_in_common);
+
   // Trigger the instantiation of a template in 'b' that uses a type defined in
   // 'b_impl'. That type is not visible here.
   UseDefinedInBImpl<int>();