diff --git a/lib/Analysis/GRExprEngine.cpp b/lib/Analysis/GRExprEngine.cpp
index b9a0ddc..40c12c9 100644
--- a/lib/Analysis/GRExprEngine.cpp
+++ b/lib/Analysis/GRExprEngine.cpp
@@ -17,6 +17,7 @@
 #include "clang/Analysis/PathSensitive/GRExprEngine.h"
 #include "clang/Analysis/PathSensitive/GRExprEngineBuilders.h"
 #include "clang/Analysis/PathSensitive/Checker.h"
+#include "clang/AST/CharUnits.h"
 #include "clang/AST/ParentMap.h"
 #include "clang/AST/StmtObjC.h"
 #include "clang/Basic/Builtins.h"
@@ -2421,12 +2422,12 @@
                                           ExplodedNode* Pred,
                                           ExplodedNodeSet& Dst) {
   QualType T = Ex->getTypeOfArgument();
-  uint64_t amt;
+  CharUnits amt;
 
   if (Ex->isSizeOf()) {
     if (T == getContext().VoidTy) {
       // sizeof(void) == 1 byte.
-      amt = 1;
+      amt = CharUnits::One();
     }
     else if (!T.getTypePtr()->isConstantSizeType()) {
       // FIXME: Add support for VLAs.
@@ -2440,14 +2441,15 @@
     }
     else {
       // All other cases.
-      amt = getContext().getTypeSize(T) / 8;
+      amt = getContext().getTypeSizeInChars(T);
     }
   }
   else  // Get alignment of the type.
-    amt = getContext().getTypeAlign(T) / 8;
+    amt = CharUnits::fromQuantity(getContext().getTypeAlign(T) / 8);
 
   MakeNode(Dst, Ex, Pred,
-           GetState(Pred)->BindExpr(Ex, ValMgr.makeIntVal(amt, Ex->getType())));
+           GetState(Pred)->BindExpr(Ex, 
+              ValMgr.makeIntVal(amt.getQuantity(), Ex->getType())));
 }
 
 
diff --git a/lib/Analysis/MemRegion.cpp b/lib/Analysis/MemRegion.cpp
index c17e4e8..87d60d3 100644
--- a/lib/Analysis/MemRegion.cpp
+++ b/lib/Analysis/MemRegion.cpp
@@ -17,6 +17,7 @@
 #include "clang/Analysis/PathSensitive/MemRegion.h"
 #include "clang/Analysis/PathSensitive/ValueManager.h"
 #include "clang/Analysis/PathSensitive/AnalysisContext.h"
+#include "clang/AST/CharUnits.h"
 #include "clang/AST/StmtVisitor.h"
 
 using namespace clang;
@@ -689,7 +690,7 @@
 }
 
 RegionRawOffset ElementRegion::getAsRawOffset() const {
-  int64_t offset = 0;
+  CharUnits offset = CharUnits::Zero();
   const ElementRegion *ER = this;
   const MemRegion *superR = NULL;
   ASTContext &C = getContext();
@@ -714,7 +715,7 @@
           break;
         }
 
-        int64_t size = (int64_t) (C.getTypeSize(elemType) / 8);
+        CharUnits size = C.getTypeSizeInChars(elemType);
         offset += (i * size);
       }
 
@@ -727,7 +728,7 @@
   }
 
   assert(superR && "super region cannot be NULL");
-  return RegionRawOffset(superR, offset);
+  return RegionRawOffset(superR, offset.getQuantity());
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Analysis/Store.cpp b/lib/Analysis/Store.cpp
index fd44a80..1724a92 100644
--- a/lib/Analysis/Store.cpp
+++ b/lib/Analysis/Store.cpp
@@ -13,6 +13,7 @@
 
 #include "clang/Analysis/PathSensitive/Store.h"
 #include "clang/Analysis/PathSensitive/GRState.h"
+#include "clang/AST/CharUnits.h"
 
 using namespace clang;
 
@@ -138,9 +139,9 @@
       if (!baseR)
         return NULL;
 
-      int64_t off = rawOff.getByteOffset();
+      CharUnits off = CharUnits::fromQuantity(rawOff.getByteOffset());
 
-      if (off == 0) {
+      if (off.isZero()) {
         // Edge case: we are at 0 bytes off the beginning of baseR.  We
         // check to see if type we are casting to is the same as the base
         // region.  If so, just return the base region.
@@ -168,7 +169,7 @@
       // We can only compute sizeof(PointeeTy) if it is a complete type.
       if (IsCompleteType(Ctx, PointeeTy)) {
         // Compute the size in **bytes**.
-        int64_t pointeeTySize = (int64_t) (Ctx.getTypeSize(PointeeTy) / 8);
+        CharUnits pointeeTySize = Ctx.getTypeSizeInChars(PointeeTy);
 
         // Is the offset a multiple of the size?  If so, we can layer the
         // ElementRegion (with elementType == PointeeTy) directly on top of
@@ -182,7 +183,7 @@
       if (!newSuperR) {
         // Create an intermediate ElementRegion to represent the raw byte.
         // This will be the super region of the final ElementRegion.
-        newSuperR = MakeElementRegion(baseR, Ctx.CharTy, off);
+        newSuperR = MakeElementRegion(baseR, Ctx.CharTy, off.getQuantity());
       }
 
       return MakeElementRegion(newSuperR, PointeeTy, newIndex);