diff --git a/fpdfsdk/src/javascript/JS_Runtime.cpp b/fpdfsdk/src/javascript/JS_Runtime.cpp
index b195b42..2d0d7f6 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime.cpp
@@ -6,8 +6,10 @@
 
 #include "JS_Runtime.h"
 
+#ifdef PDF_ENABLE_XFA
 #include "../../../xfa/src/fxjse/src/value.h"
 #include "../../include/fpdfxfa/fpdfxfa_app.h"
+#endif
 #include "Consts.h"
 #include "Document.h"
 #include "Field.h"
@@ -51,6 +53,15 @@
       m_bBlocking(FALSE),
       m_isolate(NULL),
       m_isolateManaged(false) {
+#ifndef PDF_ENABLE_XFA
+  IPDF_JSPLATFORM* pPlatform = m_pApp->GetFormFillInfo()->m_pJsPlatform;
+  if (pPlatform->version <= 2) {
+    unsigned int embedderDataSlot = 0;
+    v8::Isolate* pExternalIsolate = nullptr;
+    if (pPlatform->version == 2) {
+      pExternalIsolate = reinterpret_cast<v8::Isolate*>(pPlatform->m_isolate);
+      embedderDataSlot = pPlatform->m_v8EmbedderSlot;
+#else
   if (CPDFXFA_App::GetInstance()->GetJSERuntime()) {
     // TODO(tsepez): CPDFXFA_App should also use the embedder provided isolate.
     m_isolate = (v8::Isolate*)CPDFXFA_App::GetInstance()->GetJSERuntime();
@@ -64,7 +75,11 @@
         embedderDataSlot = pPlatform->m_v8EmbedderSlot;
       }
       FXJS_Initialize(embedderDataSlot, pExternalIsolate);
+#endif
     }
+#ifndef PDF_ENABLE_XFA
+    FXJS_Initialize(embedderDataSlot, pExternalIsolate);
+#else
     m_isolateManaged = FXJS_GetIsolate(&m_isolate);
   }
 
@@ -77,13 +92,20 @@
     FXJS_InitializeRuntime(GetIsolate(), this, &m_context, &m_StaticObjects);
     ReleaseContext(pContext);
     return;
+#endif
   }
+#ifndef PDF_ENABLE_XFA
+  m_isolateManaged = FXJS_GetIsolate(&m_isolate);
+#else
 
+#endif
   if (m_isolateManaged || FXJS_GlobalIsolateRefCount() == 0)
     DefineJSObjects();
 
+#ifdef PDF_ENABLE_XFA
   CPDFXFA_App::GetInstance()->SetJavaScriptInitialized(TRUE);
 
+#endif
   CJS_Context* pContext = (CJS_Context*)NewContext();
   FXJS_InitializeRuntime(GetIsolate(), this, &m_context, &m_StaticObjects);
   ReleaseContext(pContext);
@@ -97,6 +119,9 @@
     delete m_ContextArray.GetAt(i);
 
   m_ContextArray.RemoveAll();
+#ifndef PDF_ENABLE_XFA
+  FXJS_ReleaseRuntime(GetIsolate(), &m_context, &m_StaticObjects);
+#endif
 
   m_pApp = NULL;
   m_pDocument = NULL;
@@ -108,7 +133,9 @@
 
 void CJS_Runtime::DefineJSObjects() {
   v8::Isolate::Scope isolate_scope(GetIsolate());
+#ifdef PDF_ENABLE_XFA
   v8::Locker locker(GetIsolate());
+#endif
   v8::HandleScope handle_scope(GetIsolate());
   v8::Local<v8::Context> context = v8::Context::New(GetIsolate());
   v8::Context::Scope context_scope(context);
@@ -181,7 +208,9 @@
 void CJS_Runtime::SetReaderDocument(CPDFSDK_Document* pReaderDoc) {
   if (m_pDocument != pReaderDoc) {
     v8::Isolate::Scope isolate_scope(m_isolate);
+#ifdef PDF_ENABLE_XFA
     v8::Locker locker(m_isolate);
+#endif
     v8::HandleScope handle_scope(m_isolate);
     v8::Local<v8::Context> context =
         v8::Local<v8::Context>::New(m_isolate, m_context);
@@ -227,6 +256,7 @@
   return v8::Local<v8::Context>::New(m_isolate, m_context);
 }
 
+#ifdef PDF_ENABLE_XFA
 CFX_WideString ChangeObjName(const CFX_WideString& str) {
   CFX_WideString sRet = str;
   sRet.Replace(L"_", L".");
@@ -293,6 +323,7 @@
   return TRUE;
 }
 
+#endif
 void CJS_Runtime::AddObserver(Observer* observer) {
   ASSERT(m_observers.find(observer) == m_observers.end());
   m_observers.insert(observer);