diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 5ec3f190d34..232bfe46dc3 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -19272,7 +19272,7 @@ SDValue DAGCombiner::visitINSERT_SUBVECTOR(SDNode *N) {
   if (!isa<ConstantSDNode>(N2))
     return SDValue();
 
-  unsigned InsIdx = cast<ConstantSDNode>(N2)->getZExtValue();
+  uint64_t InsIdx = cast<ConstantSDNode>(N2)->getZExtValue();
 
   // Push subvector bitcasts to the output, adjusting the index as we go.
   // insert_subvector(bitcast(v), bitcast(s), c1)