diff --git a/Sources/Tools/MaxComponent/plClickDragComponent.cpp b/Sources/Tools/MaxComponent/plClickDragComponent.cpp
index 96eb1c0a..f60a4b9b 100644
--- a/Sources/Tools/MaxComponent/plClickDragComponent.cpp
+++ b/Sources/Tools/MaxComponent/plClickDragComponent.cpp
@@ -74,6 +74,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #include "pnMessage/plCursorChangeMsg.h"
 #include "pnMessage/plEventCallbackMsg.h"
 #include "plMessage/plAnimCmdMsg.h"
+#include "plInterp/plAnimEaseTypes.h"
 
 #include "MaxConvert/plConvert.h"
 
diff --git a/Sources/Tools/MaxComponent/plResponderAnim.cpp b/Sources/Tools/MaxComponent/plResponderAnim.cpp
index 92b210c8..bce70669 100644
--- a/Sources/Tools/MaxComponent/plResponderAnim.cpp
+++ b/Sources/Tools/MaxComponent/plResponderAnim.cpp
@@ -69,6 +69,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #include "pnSceneObject/plAudioInterface.h"
 #include "pnMessage/plSoundMsg.h"
 
+#include "plInterp/plAnimEaseTypes.h"
 #include "MaxMain/plPlasmaRefMsgs.h"
 
 enum
diff --git a/Sources/Tools/MaxConvert/hsControlConverter.cpp b/Sources/Tools/MaxConvert/hsControlConverter.cpp
index 557f1d6a..ce36dded 100644
--- a/Sources/Tools/MaxConvert/hsControlConverter.cpp
+++ b/Sources/Tools/MaxConvert/hsControlConverter.cpp
@@ -62,6 +62,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #include "MaxMain/plMaxNode.h"
 
 #include "hsMaxLayerBase.h"
+#include "plInterp/plAnimEaseTypes.h"
 #include "plInterp/plController.h"
 #include "plInterp/hsInterp.h"
 #include "MaxExport/plErrorMsg.h"