diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index 633f3c5..f83c870 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -62,7 +62,8 @@
 
 bool CompilerInstance::shouldBuildGlobalModuleIndex() const {
   return (BuildGlobalModuleIndex ||
-          (ModuleManager && ModuleManager->isGlobalIndexUnavailable())) &&
+          (ModuleManager && ModuleManager->isGlobalIndexUnavailable() &&
+           getFrontendOpts().GenerateGlobalModuleIndex)) &&
          !ModuleBuildFailed;
 }