diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
index 6345871..d65a2f2 100644
--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp
@@ -1422,9 +1422,6 @@
 {
     for (size_t i = m_forInContextStack.size(); i > 0; i--) {
         ForInContext* context = m_forInContextStack[i - 1].get();
-        if (context->base() != base)
-            continue;
-
         if (context->local() != property)
             continue;
 
@@ -2586,11 +2583,11 @@
     return dst;
 }
 
-void BytecodeGenerator::pushIndexedForInScope(RegisterID* baseRegister, RegisterID* localRegister, RegisterID* indexRegister)
+void BytecodeGenerator::pushIndexedForInScope(RegisterID* localRegister, RegisterID* indexRegister)
 {
     if (!localRegister)
         return;
-    m_forInContextStack.append(std::make_unique<IndexedForInContext>(baseRegister, localRegister, indexRegister));
+    m_forInContextStack.append(std::make_unique<IndexedForInContext>(localRegister, indexRegister));
 }
 
 void BytecodeGenerator::popIndexedForInScope(RegisterID* localRegister)
@@ -2600,11 +2597,11 @@
     m_forInContextStack.removeLast();
 }
 
-void BytecodeGenerator::pushStructureForInScope(RegisterID* baseRegister, RegisterID* localRegister, RegisterID* indexRegister, RegisterID* propertyRegister, RegisterID* enumeratorRegister)
+void BytecodeGenerator::pushStructureForInScope(RegisterID* localRegister, RegisterID* indexRegister, RegisterID* propertyRegister, RegisterID* enumeratorRegister)
 {
     if (!localRegister)
         return;
-    m_forInContextStack.append(std::make_unique<StructureForInContext>(baseRegister, localRegister, indexRegister, propertyRegister, enumeratorRegister));
+    m_forInContextStack.append(std::make_unique<StructureForInContext>(localRegister, indexRegister, propertyRegister, enumeratorRegister));
 }
 
 void BytecodeGenerator::popStructureForInScope(RegisterID* localRegister)
diff --git a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
index 7c9762d..3eba8ae 100644
--- a/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
+++ b/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h
@@ -99,9 +99,8 @@
 
     class ForInContext {
     public:
-        ForInContext(RegisterID* baseRegister, RegisterID* localRegister)
-            : m_baseRegister(baseRegister)
-            , m_localRegister(localRegister)
+        ForInContext(RegisterID* localRegister)
+            : m_localRegister(localRegister)
             , m_isValid(true)
         {
         }
@@ -119,19 +118,17 @@
         };
         virtual ForInContextType type() const = 0;
 
-        RegisterID* base() const { return m_baseRegister.get(); }
         RegisterID* local() const { return m_localRegister.get(); }
 
     private:
-        RefPtr<RegisterID> m_baseRegister;
         RefPtr<RegisterID> m_localRegister;
         bool m_isValid;
     };
 
     class StructureForInContext : public ForInContext {
     public:
-        StructureForInContext(RegisterID* baseRegister, RegisterID* localRegister, RegisterID* indexRegister, RegisterID* propertyRegister, RegisterID* enumeratorRegister)
-            : ForInContext(baseRegister, localRegister)
+        StructureForInContext(RegisterID* localRegister, RegisterID* indexRegister, RegisterID* propertyRegister, RegisterID* enumeratorRegister)
+            : ForInContext(localRegister)
             , m_indexRegister(indexRegister)
             , m_propertyRegister(propertyRegister)
             , m_enumeratorRegister(enumeratorRegister)
@@ -155,8 +152,8 @@
 
     class IndexedForInContext : public ForInContext {
     public:
-        IndexedForInContext(RegisterID* baseRegister, RegisterID* localRegister, RegisterID* indexRegister)
-            : ForInContext(baseRegister, localRegister)
+        IndexedForInContext(RegisterID* localRegister, RegisterID* indexRegister)
+            : ForInContext(localRegister)
             , m_indexRegister(indexRegister)
         {
         }
@@ -527,9 +524,9 @@
         void pushFinallyContext(StatementNode* finallyBlock);
         void popFinallyContext();
 
-        void pushIndexedForInScope(RegisterID* base, RegisterID* local, RegisterID* index);
+        void pushIndexedForInScope(RegisterID* local, RegisterID* index);
         void popIndexedForInScope(RegisterID* local);
-        void pushStructureForInScope(RegisterID* base, RegisterID* local, RegisterID* index, RegisterID* property, RegisterID* enumerator);
+        void pushStructureForInScope(RegisterID* local, RegisterID* index, RegisterID* property, RegisterID* enumerator);
         void popStructureForInScope(RegisterID* local);
         void invalidateForInContextForLocal(RegisterID* local);
 
diff --git a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
index 6acfc01..573dbec 100644
--- a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
+++ b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
@@ -2070,7 +2070,7 @@
         generator.emitToIndexString(propertyName.get(), i.get());
         this->emitLoopHeader(generator, propertyName.get());
 
-        generator.pushIndexedForInScope(base.get(), local.get(), i.get());
+        generator.pushIndexedForInScope(local.get(), i.get());
         generator.emitNode(dst, m_statement);
         generator.popIndexedForInScope(local.get());
 
@@ -2104,7 +2104,7 @@
 
         this->emitLoopHeader(generator, propertyName.get());
 
-        generator.pushStructureForInScope(base.get(), local.get(), i.get(), propertyName.get(), structureEnumerator.get());
+        generator.pushStructureForInScope(local.get(), i.get(), propertyName.get(), structureEnumerator.get());
         generator.emitNode(dst, m_statement);
         generator.popStructureForInScope(local.get());