diff --git a/Source/JavaScriptCore/runtime/Error.h b/Source/JavaScriptCore/runtime/Error.h
index cb7bf3a..26bb89f 100644
--- a/Source/JavaScriptCore/runtime/Error.h
+++ b/Source/JavaScriptCore/runtime/Error.h
@@ -67,7 +67,7 @@
 JSObject* createGetterTypeError(JSGlobalObject*, const String&);
 
 std::unique_ptr<Vector<StackFrame>> getStackTrace(JSGlobalObject*, VM&, JSObject*, bool useCurrentFrame);
-void getBytecodeOffset(VM&, CallFrame*, Vector<StackFrame>*, CallFrame*&, unsigned& bytecodeOffset);
+void getBytecodeIndex(VM&, CallFrame*, Vector<StackFrame>*, CallFrame*&, BytecodeIndex&);
 bool getLineColumnAndSource(Vector<StackFrame>* stackTrace, unsigned& line, unsigned& column, String& sourceURL);
 bool addErrorInfo(VM&, Vector<StackFrame>*, JSObject*);
 JS_EXPORT_PRIVATE void addErrorInfo(JSGlobalObject*, JSObject*, bool);