diff --git a/spine-cpp/spine-cpp/include/spine/Atlas.h b/spine-cpp/spine-cpp/include/spine/Atlas.h
index 915697d99..243f02b36 100644
--- a/spine-cpp/spine-cpp/include/spine/Atlas.h
+++ b/spine-cpp/spine-cpp/include/spine/Atlas.h
@@ -65,7 +65,11 @@ enum TextureWrap {
 	TextureWrap_Repeat
 };
 
-class AtlasPage : public SpineObject, public HasRendererObject {
+class 
+#ifdef SPINE_UE4
+	SPINEPLUGIN_API
+#endif	
+AtlasPage : public SpineObject, public HasRendererObject {
 public:
 	String name;
 	Format format;
@@ -83,7 +87,11 @@ public:
 	virtual ~AtlasPage() { }
 };
 
-class AtlasRegion : public SpineObject {
+class 
+#ifdef SPINE_UE4
+	SPINEPLUGIN_API
+#endif	
+AtlasRegion : public SpineObject {
 public:
 	AtlasPage *page;
 	String name;
@@ -99,7 +107,11 @@ public:
 
 class TextureLoader;
 
-class Atlas : public SpineObject {
+class 
+#ifdef SPINE_UE4
+	SPINEPLUGIN_API
+#endif
+Atlas : public SpineObject {
 public:
 	Atlas(const String &path, TextureLoader *textureLoader);
 
diff --git a/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpinePlugin.cpp b/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpinePlugin.cpp
index 60f93f86c..c0ccd7dd9 100644
--- a/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpinePlugin.cpp
+++ b/spine-ue4/Plugins/SpinePlugin/Source/SpinePlugin/Private/SpinePlugin.cpp
@@ -29,6 +29,7 @@
  *****************************************************************************/
 
 #include "SpinePluginPrivatePCH.h"
+#include "spine/Extension.h"
 
 class FSpinePlugin : public SpinePlugin {
 	virtual void StartupModule() override;
@@ -42,5 +43,9 @@ void FSpinePlugin::StartupModule() {
 
 void FSpinePlugin::ShutdownModule() { }
 
+spine::SpineExtension* spine::getDefaultExtension() {
+	return new spine::DefaultSpineExtension();
+}
+