diff --git a/core/fpdfdoc/cpdf_interactiveform.cpp b/core/fpdfdoc/cpdf_interactiveform.cpp
index 6d23bfb..ce0cdac 100644
--- a/core/fpdfdoc/cpdf_interactiveform.cpp
+++ b/core/fpdfdoc/cpdf_interactiveform.cpp
@@ -938,39 +938,30 @@
 }
 
 std::unique_ptr<CFDF_Document> CPDF_InteractiveForm::ExportToFDF(
-    const WideString& pdf_path,
-    bool bSimpleFileSpec) const {
+    const WideString& pdf_path) const {
   std::vector<CPDF_FormField*> fields;
   CFieldTree::Node* pRoot = m_pFieldTree->GetRoot();
   const size_t nCount = pRoot->CountFields();
   for (size_t i = 0; i < nCount; ++i)
     fields.push_back(pRoot->GetFieldAtIndex(i));
-  return ExportToFDF(pdf_path, fields, true, bSimpleFileSpec);
+  return ExportToFDF(pdf_path, fields, true);
 }
 
 std::unique_ptr<CFDF_Document> CPDF_InteractiveForm::ExportToFDF(
     const WideString& pdf_path,
     const std::vector<CPDF_FormField*>& fields,
-    bool bIncludeOrExclude,
-    bool bSimpleFileSpec) const {
+    bool bIncludeOrExclude) const {
   std::unique_ptr<CFDF_Document> pDoc = CFDF_Document::CreateNewDoc();
   if (!pDoc)
     return nullptr;
 
   CPDF_Dictionary* pMainDict = pDoc->GetRoot()->GetDictFor("FDF");
   if (!pdf_path.IsEmpty()) {
-    if (bSimpleFileSpec) {
-      WideString wsFilePath = CPDF_FileSpec::EncodeFileName(pdf_path);
-      pMainDict->SetNewFor<CPDF_String>(pdfium::stream::kF,
-                                        wsFilePath.ToDefANSI(), false);
-      pMainDict->SetNewFor<CPDF_String>("UF", wsFilePath);
-    } else {
-      auto pNewDict = pDoc->New<CPDF_Dictionary>();
-      pNewDict->SetNewFor<CPDF_Name>("Type", "Filespec");
-      CPDF_FileSpec filespec(pNewDict.Get());
-      filespec.SetFileName(pdf_path);
-      pMainDict->SetFor("F", pNewDict);
-    }
+    auto pNewDict = pDoc->New<CPDF_Dictionary>();
+    pNewDict->SetNewFor<CPDF_Name>("Type", "Filespec");
+    CPDF_FileSpec filespec(pNewDict.Get());
+    filespec.SetFileName(pdf_path);
+    pMainDict->SetFor("F", pNewDict);
   }
 
   CPDF_Array* pFields = pMainDict->SetNewFor<CPDF_Array>("Fields");
diff --git a/core/fpdfdoc/cpdf_interactiveform.h b/core/fpdfdoc/cpdf_interactiveform.h
index 1d69ce4..9bac8aa 100644
--- a/core/fpdfdoc/cpdf_interactiveform.h
+++ b/core/fpdfdoc/cpdf_interactiveform.h
@@ -75,14 +75,11 @@
   bool CheckRequiredFields(const std::vector<CPDF_FormField*>* fields,
                            bool bIncludeOrExclude) const;
 
-  std::unique_ptr<CFDF_Document> ExportToFDF(const WideString& pdf_path,
-                                             bool bSimpleFileSpec) const;
-
+  std::unique_ptr<CFDF_Document> ExportToFDF(const WideString& pdf_path) const;
   std::unique_ptr<CFDF_Document> ExportToFDF(
       const WideString& pdf_path,
       const std::vector<CPDF_FormField*>& fields,
-      bool bIncludeOrExclude,
-      bool bSimpleFileSpec) const;
+      bool bIncludeOrExclude) const;
 
   void ResetForm();
 
diff --git a/fpdfsdk/cpdfsdk_interactiveform.cpp b/fpdfsdk/cpdfsdk_interactiveform.cpp
index 3ed3a7d..8a4bcea 100644
--- a/fpdfsdk/cpdfsdk_interactiveform.cpp
+++ b/fpdfsdk/cpdfsdk_interactiveform.cpp
@@ -458,7 +458,7 @@
     const std::vector<CPDF_FormField*>& fields,
     bool bIncludeOrExclude) {
   std::unique_ptr<CFDF_Document> pFDF = m_pInteractiveForm->ExportToFDF(
-      m_pFormFillEnv->GetFilePath(), fields, bIncludeOrExclude, false);
+      m_pFormFillEnv->GetFilePath(), fields, bIncludeOrExclude);
 
   return pFDF ? pFDF->WriteToString() : ByteString();
 }
@@ -468,7 +468,7 @@
     return false;
 
   std::unique_ptr<CFDF_Document> pFDFDoc =
-      m_pInteractiveForm->ExportToFDF(m_pFormFillEnv->GetFilePath(), false);
+      m_pInteractiveForm->ExportToFDF(m_pFormFillEnv->GetFilePath());
   if (!pFDFDoc)
     return false;
 
@@ -484,7 +484,7 @@
 
 ByteString CPDFSDK_InteractiveForm::ExportFormToFDFTextBuf() {
   std::unique_ptr<CFDF_Document> pFDF =
-      m_pInteractiveForm->ExportToFDF(m_pFormFillEnv->GetFilePath(), false);
+      m_pInteractiveForm->ExportToFDF(m_pFormFillEnv->GetFilePath());
 
   return pFDF ? pFDF->WriteToString() : ByteString();
 }