diff --git a/dtool/src/parser-inc/Core.h b/dtool/src/parser-inc/Core.h
index ec9547a73f..3c7bae0fee 100755
--- a/dtool/src/parser-inc/Core.h
+++ b/dtool/src/parser-inc/Core.h
@@ -2,5 +2,7 @@
 
 namespace SpeedTree {
   class CCore;
+  class CInstance;
   class SGeometry;
+  class CView;
 };
diff --git a/dtool/src/parser-inc/DirectX9Renderer.h b/dtool/src/parser-inc/DirectX9Renderer.h
new file mode 100755
index 0000000000..328705090f
--- /dev/null
+++ b/dtool/src/parser-inc/DirectX9Renderer.h
@@ -0,0 +1,7 @@
+// SpeedTree.
+
+namespace SpeedTree {
+  class CTreeRender;
+  class CForestRender;
+  class SForestCullResultsRender;
+};
diff --git a/dtool/src/parser-inc/Forest.h b/dtool/src/parser-inc/Forest.h
index ccf182c7c8..3a43be32da 100755
--- a/dtool/src/parser-inc/Forest.h
+++ b/dtool/src/parser-inc/Forest.h
@@ -2,5 +2,7 @@
 
 namespace SpeedTree {
   class CTree;
-  class CForest;
+  class CForest {
+    class SPopulationStats;
+  };
 };
diff --git a/dtool/src/parser-inc/OpenGLRenderer.h b/dtool/src/parser-inc/OpenGLRenderer.h
index 50acf0a1a6..328705090f 100755
--- a/dtool/src/parser-inc/OpenGLRenderer.h
+++ b/dtool/src/parser-inc/OpenGLRenderer.h
@@ -3,4 +3,5 @@
 namespace SpeedTree {
   class CTreeRender;
   class CForestRender;
+  class SForestCullResultsRender;
 };
diff --git a/dtool/src/parser-inc/Sources.pp b/dtool/src/parser-inc/Sources.pp
index deca2102d8..650b5a34bf 100644
--- a/dtool/src/parser-inc/Sources.pp
+++ b/dtool/src/parser-inc/Sources.pp
@@ -23,5 +23,6 @@
     libavcodec/avcodec.h libswscale/swscale.h \
     libavformat/avio.h AR/ar.h \
     WebCore.h WebView.h WebViewListener.h \
-    Core/Core.h Forest/Forest.h Renderers/OpenGL/OpenGLRenderer.h
+    Core/Core.h Forest/Forest.h Renderers/OpenGL/OpenGLRenderer.h \
+    Renderers/DirectX9/DirectX9Renderer.h