diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 315214385bb..a0488e1b1cc 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1875,7 +1875,7 @@ SDValue DAGCombiner::visitADD(SDNode *N) {
     // and similar xforms where the inner op is either ~0 or 0.
     if (NumSignBits == DestBits &&
         isOneConstantOrOneSplatConstant(N1->getOperand(1)))
-      return DAG.getNode(ISD::SUB, DL, VT, N->getOperand(0), AndOp0);
+      return DAG.getNode(ISD::SUB, DL, VT, N0, AndOp0);
   }
 
   // add (sext i1), X -> sub X, (zext i1)