diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 77455c075cab0..1d77fbe016307 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -876,7 +876,7 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
           << PluginFN << toString(PassPlugin.takeError());
     }
   }
-  for (auto PassCallback : CodeGenOpts.PassBuilderCallbacks)
+  for (const auto &PassCallback : CodeGenOpts.PassBuilderCallbacks)
     PassCallback(PB);
 #define HANDLE_EXTENSION(Ext)                                                  \
   get##Ext##PluginInfo().RegisterPassBuilderCallbacks(PB);