diff --git a/headers/private/kernel/arch/ppc/arch_thread_types.h b/headers/private/kernel/arch/ppc/arch_thread_types.h
index 17c3aa851b..7b2718496f 100644
--- a/headers/private/kernel/arch/ppc/arch_thread_types.h
+++ b/headers/private/kernel/arch/ppc/arch_thread_types.h
@@ -1,10 +1,14 @@
-/* 
+/*
 ** Copyright 2001, Travis Geiselbrecht. All rights reserved.
 ** Distributed under the terms of the NewOS License.
 */
 #ifndef KERNEL_ARCH_PPC_THREAD_TYPES_H
 #define KERNEL_ARCH_PPC_THREAD_TYPES_H
 
+
+#include <SupportDefs.h>
+
+
 #define	IFRAME_TRACE_DEPTH 4
 
 struct iframe_stack {