diff --git a/test/Modules/cxx-many-overloads.cpp b/test/Modules/cxx-many-overloads.cpp
index 84e4140b93..205a79cdf9 100644
--- a/test/Modules/cxx-many-overloads.cpp
+++ b/test/Modules/cxx-many-overloads.cpp
@@ -1,5 +1,5 @@
 // RUN: rm -rf %t
-// RUN: %clang_cc1 -x objective-c++ -fmodules -fmodule-cache-path %t -I %S/Inputs %s -verify
+// RUN: %clang_cc1 -x objective-c++ -fmodules -fmodules-cache-path=%t -I %S/Inputs %s -verify
 
 // expected-no-diagnostics
 @import cxx_many_overloads;