diff --git a/clang/test/Modules/pr21547.cpp b/clang/test/Modules/pr21547.cpp
index db3b6dd36a94..c6275b4cc7f1 100644
--- a/clang/test/Modules/pr21547.cpp
+++ b/clang/test/Modules/pr21547.cpp
@@ -1,6 +1,7 @@
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -I%S/Inputs/PR21547 -verify %s
 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I%S/Inputs/PR21547 -verify %s
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I%S/Inputs/PR21547 -emit-llvm-only %s
 
 #include "Inputs/PR21547/FirstHeader.h"