diff --git a/cpu/arm720t/serial.c b/cpu/arm720t/serial.c
index 27eb73ad889ea141882472948720ac9997bd906a..1b0e147e1691f79e6b13d62a80fe2083bac27b70 100644
--- a/cpu/arm720t/serial.c
+++ b/cpu/arm720t/serial.c
@@ -125,6 +125,8 @@ serial_puts (const char *s)
 
 #elif defined(CONFIG_LPC2292)
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #include <asm/arch/hardware.h>
 
 void serial_setbrg (void)