diff --git a/core/fpdfdoc/cpdf_formfield.cpp b/core/fpdfdoc/cpdf_formfield.cpp
index 7b1b6ff..3db9c86 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -120,10 +120,8 @@
   const CPDF_Object* ff_attr =
       FPDF_GetFieldAttr(m_pDict.Get(), pdfium::form_fields::kFf);
   uint32_t flags = ff_attr ? ff_attr->GetInteger() : 0;
-  if (flags & pdfium::form_flags::kReadOnly) {
+  if (flags & pdfium::form_flags::kReadOnly)
     m_Flags |= pdfium::form_flags::kReadOnly;
-    m_bReadOnly = true;
-  }
   if (flags & pdfium::form_flags::kRequired) {
     m_Flags |= pdfium::form_flags::kRequired;
     m_bRequired = true;
diff --git a/core/fpdfdoc/cpdf_formfield.h b/core/fpdfdoc/cpdf_formfield.h
index a07720f..a16f777 100644
--- a/core/fpdfdoc/cpdf_formfield.h
+++ b/core/fpdfdoc/cpdf_formfield.h
@@ -124,8 +124,6 @@
   uint32_t GetFieldFlags() const;
   ByteString GetDefaultStyle() const;
 
-  // TODO(thestig): Figure out what to do with unused methods here.
-  bool IsReadOnly() const { return m_bReadOnly; }
   bool IsRequired() const { return m_bRequired; }
   bool IsNoExport() const { return m_bNoExport; }
 
@@ -195,7 +193,6 @@
   const std::vector<UnownedPtr<CPDF_FormControl>>& GetControls() const;
 
   CPDF_FormField::Type m_Type = kUnknown;
-  bool m_bReadOnly = false;
   bool m_bRequired = false;
   bool m_bNoExport = false;
   uint32_t m_Flags = 0;