diff --git a/lib/IR/ConstantFold.cpp b/lib/IR/ConstantFold.cpp
index 2efc61242ea..46bb20e0d1b 100644
--- a/lib/IR/ConstantFold.cpp
+++ b/lib/IR/ConstantFold.cpp
@@ -2163,11 +2163,11 @@ static Constant *ConstantFoldGetElementPtrImpl(Type *PointeeTy, Constant *C,
   // Check to see if any array indices are not within the corresponding
   // notional array or vector bounds. If so, try to determine if they can be
   // factored out into preceding dimensions.
-  bool Unknown = false;
   SmallVector<Constant *, 8> NewIdxs;
-  Type *Ty = C->getType();
-  Type *Prev = nullptr;
-  for (unsigned i = 0, e = Idxs.size(); i != e;
+  Type *Ty = PointeeTy;
+  Type *Prev = C->getType();
+  bool Unknown = !isa<ConstantInt>(Idxs[0]);
+  for (unsigned i = 1, e = Idxs.size(); i != e;
        Prev = Ty, Ty = cast<CompositeType>(Ty)->getTypeAtIndex(Idxs[i]), ++i) {
     if (ConstantInt *CI = dyn_cast<ConstantInt>(Idxs[i])) {
       if (isa<ArrayType>(Ty) || isa<VectorType>(Ty))