diff --git a/cpu/arm920t/s3c24x0/timer.c b/cpu/arm920t/s3c24x0/timer.c
index 20cedd463967f2339736d110d50874541a5dbb56..a27f0e273cec779639b678e15afa73c070b743ea 100644
--- a/cpu/arm920t/s3c24x0/timer.c
+++ b/cpu/arm920t/s3c24x0/timer.c
@@ -205,6 +205,8 @@ void reset_cpu(ulong ignored)
 	struct s3c24x0_watchdog *watchdog;
 
 #ifdef CONFIG_TRAB
+	extern void disable_vfd(void);
+
 	disable_vfd();
 #endif