diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index 315f7b1..6736497 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -18,6 +18,7 @@
 #define ART_RUNTIME_MIRROR_STRING_INL_H_
 
 #include "array.h"
+#include "class.h"
 #include "intern_table.h"
 #include "runtime.h"
 #include "string.h"
@@ -26,6 +27,11 @@
 namespace art {
 namespace mirror {
 
+inline uint32_t String::ClassSize() {
+  uint32_t vtable_entries = Object::kVTableLength + 51;
+  return Class::ComputeClassSize(true, vtable_entries, 1, 1, 2);
+}
+
 inline CharArray* String::GetCharArray() {
   return GetFieldObject<CharArray>(ValueOffset());
 }