diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index b8aac9d..120dcd8 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -459,7 +459,7 @@
         const Type *IndexedTy = GTI.getIndexedType();
         if (!IndexedTy->isSized()) return;
         unsigned GEPOpiBits = Index->getType()->getPrimitiveSizeInBits();
-        uint64_t TypeSize = TD ? TD->getABITypeSize(IndexedTy) : 1;
+        uint64_t TypeSize = TD ? TD->getTypePaddedSize(IndexedTy) : 1;
         LocalMask = APInt::getAllOnesValue(GEPOpiBits);
         LocalKnownZero = LocalKnownOne = APInt(GEPOpiBits, 0);
         ComputeMaskedBits(Index, LocalMask,