diff --git a/headers/private/kernel/arch/timer.h b/headers/private/kernel/arch/timer.h
index d5ef94d164..29a89520b1 100644
--- a/headers/private/kernel/arch/timer.h
+++ b/headers/private/kernel/arch/timer.h
@@ -1,6 +1,6 @@
-/* 
-** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
-** Distributed under the terms of the NewOS License.
+/*
+** Copyright 2004, The OpenBeOS Team. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
 */
 #ifndef KERNEL_ARCH_TIMER_H
 #define KERNEL_ARCH_TIMER_H
@@ -9,9 +9,16 @@
 
 struct kernel_args;
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
-void arch_timer_set_hardware_timer(bigtime_t timeout);
-void arch_timer_clear_hardware_timer(void);
-int arch_init_timer(struct kernel_args *ka);
+extern void arch_timer_set_hardware_timer(bigtime_t timeout);
+extern void arch_timer_clear_hardware_timer(void);
+extern int arch_init_timer(struct kernel_args *args);
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif	/* KERNEL_ARCH_TIMER_H */