diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index cc7055d..0e36a0a 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/CharUnits.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/DeclTemplate.h"
@@ -818,6 +819,15 @@
   return std::make_pair(Width, Align);
 }
 
+/// getTypeSizeInChars - Return the size of the specified type, in characters.
+/// This method does not work on incomplete types.
+CharUnits ASTContext::getTypeSizeInChars(QualType T) {
+  return CharUnits::fromRaw(getTypeSize(T) / getCharWidth());
+}
+CharUnits ASTContext::getTypeSizeInChars(const Type *T) {
+  return CharUnits::fromRaw(getTypeSize(T) / getCharWidth());
+}
+
 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified
 /// type for the current target in bits.  This can be different than the ABI
 /// alignment in cases where it is beneficial for performance to overalign