diff --git a/utils/TableGen/CodeGenDAGPatterns.cpp b/utils/TableGen/CodeGenDAGPatterns.cpp
index e48ba384532..5200cda8faa 100644
--- a/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -2304,7 +2304,7 @@ InferAllTypes(const StringMap<SmallVector<TreePatternNode*,1> > *InNamedTypes) {
   bool MadeChange = true;
   while (MadeChange) {
     MadeChange = false;
-    for (TreePatternNode *Tree : Trees) {
+    for (TreePatternNode *&Tree : Trees) {
       MadeChange |= Tree->ApplyTypeConstraints(*this, false);
       MadeChange |= SimplifyTree(Tree);
     }