diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index 1e9d5d4b871e2a5d3fe3adb3cd71c6a329df7fa8..e15d357354bb0dd9eb9acc1fd8131c452eae6ea3 100644
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -214,8 +214,6 @@ static void addMemorySanitizerPass(const PassManagerBuilder &Builder,
 
 static void addThreadSanitizerPass(const PassManagerBuilder &Builder,
                                    PassManagerBase &PM) {
-  const PassManagerBuilderWrapper &BuilderWrapper =
-      static_cast<const PassManagerBuilderWrapper&>(Builder);
   PM.add(createThreadSanitizerPass());
 }