diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 526f7742be0..40995849238 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5899,7 +5899,6 @@ void SelectionDAGISel::LowerArguments(const BasicBlock *LLVMBB) {
   // If this is the entry block, emit arguments.
   const Function &F = *LLVMBB->getParent();
   SelectionDAG &DAG = SDB->DAG;
-  SDValue OldRoot = DAG.getRoot();
   DebugLoc dl = SDB->getCurDebugLoc();
   const TargetData *TD = TLI.getTargetData();
   SmallVector<ISD::InputArg, 16> Ins;