1 files changed, 5 insertions, 2 deletions
diff --git a/Source/JavaScriptCore/runtime/SparseArrayValueMap.h b/Source/JavaScriptCore/runtime/SparseArrayValueMap.h
index ff36caa71..113beb350 100644
--- a/Source/JavaScriptCore/runtime/SparseArrayValueMap.h
+++ b/Source/JavaScriptCore/runtime/SparseArrayValueMap.h
@@ -32,6 +32,7 @@
 #include "PutDirectIndexMode.h"
 #include "WriteBarrier.h"
 #include <wtf/HashMap.h>
+#include <wtf/Platform.h>
 
 namespace JSC {
 
@@ -51,10 +52,9 @@ struct SparseArrayEntry : public WriteBarrier<Unknown> {
     unsigned attributes;
 };
 
-class SparseArrayValueMap final : public JSCell {
+class SparseArrayValueMap : public JSCell {
 public:
     typedef JSCell Base;
-    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
     
 private:
     typedef HashMap<uint64_t, SparseArrayEntry, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t>> Map;
@@ -70,6 +70,8 @@ private:
     
     void finishCreation(VM&);
 
+    static const unsigned StructureFlags = OverridesVisitChildren | JSCell::StructureFlags;
+
 public:
     DECLARE_EXPORT_INFO;
     
@@ -80,6 +82,7 @@ public:
     static SparseArrayValueMap* create(VM&);
     
     static const bool needsDestruction = true;
+    static const bool hasImmortalStructure = true;
     static void destroy(JSCell*);
     
     static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);