diff --git a/fxjs/cfxjse_engine.cpp b/fxjs/cfxjse_engine.cpp
index c3b9dd3..a4fc0a2 100644
--- a/fxjs/cfxjse_engine.cpp
+++ b/fxjs/cfxjse_engine.cpp
@@ -102,12 +102,7 @@
       m_JsContext(CFXJSE_Context::Create(fxjs_runtime->GetIsolate(),
                                          &GlobalClassDescriptor,
                                          pDocument->GetRoot())),
-      m_pJsClass(nullptr),
-      m_eScriptType(CXFA_Script::Type::Unknown),
-      m_pScriptNodeArray(nullptr),
-      m_ResolveProcessor(pdfium::MakeUnique<CFXJSE_ResolveProcessor>()),
-      m_pThisObject(nullptr),
-      m_eRunAtType(XFA_AttributeEnum::Client) {
+      m_ResolveProcessor(pdfium::MakeUnique<CFXJSE_ResolveProcessor>()) {
   RemoveBuiltInObjs(m_JsContext.get());
   m_JsContext->EnableCompatibleMode();
 
diff --git a/fxjs/cfxjse_engine.h b/fxjs/cfxjse_engine.h
index 632010d..4d4daf8 100644
--- a/fxjs/cfxjse_engine.h
+++ b/fxjs/cfxjse_engine.h
@@ -110,8 +110,8 @@
   UnownedPtr<CJS_Runtime> const m_pSubordinateRuntime;
   UnownedPtr<CXFA_Document> const m_pDocument;
   std::unique_ptr<CFXJSE_Context> m_JsContext;
-  CFXJSE_Class* m_pJsClass;
-  CXFA_Script::Type m_eScriptType;
+  CFXJSE_Class* m_pJsClass = nullptr;
+  CXFA_Script::Type m_eScriptType = CXFA_Script::Type::Unknown;
   std::map<CXFA_Object*, std::unique_ptr<CFXJSE_Value>> m_mapObjectToValue;
   std::map<CXFA_Object*, std::unique_ptr<CFXJSE_Context>>
       m_mapVariableToContext;
@@ -119,11 +119,11 @@
   std::vector<CXFA_Node*> m_upObjectArray;
   // CacheList holds the List items so we can clean them up when we're done.
   std::vector<std::unique_ptr<CXFA_List>> m_CacheList;
-  std::vector<CXFA_Node*>* m_pScriptNodeArray;
+  std::vector<CXFA_Node*>* m_pScriptNodeArray = nullptr;
   std::unique_ptr<CFXJSE_ResolveProcessor> m_ResolveProcessor;
   std::unique_ptr<CFXJSE_FormCalcContext> m_FM2JSContext;
-  CXFA_Object* m_pThisObject;
-  XFA_AttributeEnum m_eRunAtType;
+  CXFA_Object* m_pThisObject = nullptr;
+  XFA_AttributeEnum m_eRunAtType = XFA_AttributeEnum::Client;
 };
 
 #endif  //  FXJS_CFXJSE_ENGINE_H_