1 files changed, 2 insertions, 0 deletions
diff --git a/runtime/mirror/string.h b/runtime/mirror/string.h
index 6b7dfd5d84..665446c1f4 100644
--- a/runtime/mirror/string.h
+++ b/runtime/mirror/string.h
@@ -30,6 +30,7 @@ enum AllocatorType : char;
 
 template<class T> class Handle;
 template<class MirrorType> class ObjPtr;
+class StringBuilderAppend;
 struct StringOffsets;
 class StubTest_ReadBarrierForRoot_Test;
 
@@ -272,6 +273,7 @@ class MANAGED String final : public Object {
     uint8_t value_compressed_[0];
   };
 
+  friend class art::StringBuilderAppend;
   friend struct art::StringOffsets;  // for verifying offset information
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(String);