diff --git a/Engine/source/T3D/accumulationVolume.cpp b/Engine/source/T3D/accumulationVolume.cpp
index 7eef90634..f25c775ee 100644
--- a/Engine/source/T3D/accumulationVolume.cpp
+++ b/Engine/source/T3D/accumulationVolume.cpp
@@ -42,6 +42,7 @@
 #include "scene/sceneContainer.h"
 
 #include "math/mPolyhedron.impl.h"
+#include "scene/mixin/scenePolyhedralObject.impl.h"
 
 Vector< SimObjectPtr<SceneObject> > AccumulationVolume::smAccuObjects;
 Vector< SimObjectPtr<AccumulationVolume> > AccumulationVolume::smAccuVolumes;
diff --git a/Engine/source/T3D/occlusionVolume.cpp b/Engine/source/T3D/occlusionVolume.cpp
index 7accbd507..c15dd08fb 100644
--- a/Engine/source/T3D/occlusionVolume.cpp
+++ b/Engine/source/T3D/occlusionVolume.cpp
@@ -31,7 +31,7 @@
 #include "util/tempAlloc.h"
 
 #include "math/mPolyhedron.impl.h"
-
+#include "scene/mixin/scenePolyhedralObject.impl.h"
 
 //#define DEBUG_DRAW