diff --git a/engine/shared/library/sharedObject/src/shared/customization/CustomizationVariable.h b/engine/shared/library/sharedObject/src/shared/customization/CustomizationVariable.h
index 15d72b18..ea6b84cb 100644
--- a/engine/shared/library/sharedObject/src/shared/customization/CustomizationVariable.h
+++ b/engine/shared/library/sharedObject/src/shared/customization/CustomizationVariable.h
@@ -11,6 +11,7 @@
 
 // ======================================================================
 
+class CustomizationData;
 class CustomizationVariable;
 class ObjectTemplateCustomizationDataWriter;
 
diff --git a/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplate.h b/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplate.h
index 6a6999d3..68a5ab57 100644
--- a/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplate.h
+++ b/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplate.h
@@ -19,6 +19,8 @@ class BaseClass;
 class BaseExtent;
 class Extent;
 class IndexedTriangleList;
+class Portal;
+class Iff;
 
 #include "sharedMath/Plane.h"
 #include "sharedMath/VectorArgb.h"
diff --git a/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplateList.h b/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplateList.h
index de679a7c..52a43881 100644
--- a/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplateList.h
+++ b/engine/shared/library/sharedObject/src/shared/portal/PortalPropertyTemplateList.h
@@ -12,6 +12,7 @@
 // ======================================================================
 
 class CrcString;
+class PortalPropertyTemplate;
 
 // ======================================================================