diff --git a/Sources/Tools/MaxComponent/plCAnimParamBlock.h b/Sources/Tools/MaxComponent/plCAnimParamBlock.h
index 7d5a7447..5ca2f833 100644
--- a/Sources/Tools/MaxComponent/plCAnimParamBlock.h
+++ b/Sources/Tools/MaxComponent/plCAnimParamBlock.h
@@ -61,6 +61,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #ifndef _plCAnimParamBlock_h
 #define _plCAnimParamBlock_h
 
+#include "HeadSpin.h"
 #include "Max.h"
 #include "iparamb2.h"
 #include "iparamm2.h"
diff --git a/Sources/Tools/MaxComponent/plComponentBase.h b/Sources/Tools/MaxComponent/plComponentBase.h
index 817a51a9..7fc3e6c6 100644
--- a/Sources/Tools/MaxComponent/plComponentBase.h
+++ b/Sources/Tools/MaxComponent/plComponentBase.h
@@ -42,6 +42,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #ifndef PL_COMPONENT_BASE_H
 #define PL_COMPONENT_BASE_H
 
+#include "HeadSpin.h"
 #include "Max.h"
 #include "iparamb2.h"
 #include "iparamm2.h"
diff --git a/Sources/Tools/MaxComponent/plPickNodeBase.h b/Sources/Tools/MaxComponent/plPickNodeBase.h
index c45bd707..46edc80c 100644
--- a/Sources/Tools/MaxComponent/plPickNodeBase.h
+++ b/Sources/Tools/MaxComponent/plPickNodeBase.h
@@ -42,6 +42,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #ifndef plPickNodeBase_h_inc
 #define plPickNodeBase_h_inc
 
+#include "HeadSpin.h"
 #include "max.h"
 #include <vector>
 
diff --git a/Sources/Tools/MaxConvert/plLayerConverter.cpp b/Sources/Tools/MaxConvert/plLayerConverter.cpp
index 3144d2c2..1b57792d 100644
--- a/Sources/Tools/MaxConvert/plLayerConverter.cpp
+++ b/Sources/Tools/MaxConvert/plLayerConverter.cpp
@@ -59,6 +59,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 ///////////////////////////////////////////////////////////////////////////////
 
 
+#include "HeadSpin.h"
 #include "Max.h"
 #include "stdmat.h"
 #include "istdplug.h"
diff --git a/Sources/Tools/MaxPlasmaMtls/Materials/plClothingMtl.h b/Sources/Tools/MaxPlasmaMtls/Materials/plClothingMtl.h
index 3c8e77b3..007c51fb 100644
--- a/Sources/Tools/MaxPlasmaMtls/Materials/plClothingMtl.h
+++ b/Sources/Tools/MaxPlasmaMtls/Materials/plClothingMtl.h
@@ -42,6 +42,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #ifndef PL_CLOTHINGMTL_H
 #define PL_CLOTHINGMTL_H
 
+#include "HeadSpin.h"
 #include "Max.h"
 #include "iparamb2.h"
 #include "../resource.h"