diff --git a/rtl837x_common.h b/rtl837x_common.h
index 038849a..eb7e99e 100644
--- a/rtl837x_common.h
+++ b/rtl837x_common.h
@@ -70,6 +70,15 @@ struct flash_region_t {
 
 extern __xdata uint8_t uip_buf[UIP_CONF_BUFFER_SIZE+2];
 
+// 8899 04 0000 20 0004
+struct rtl_tag {
+	uint16_t tag;
+	uint8_t version;
+	uint16_t dummy;
+	uint8_t flag;
+	uint16_t pmask;
+};
+
 
 // Headers for calls in the common code area (HOME/BANK0)
 void print_string(__code char *p);
diff --git a/rtl837x_stp.c b/rtl837x_stp.c
index 54207e4..3aca109 100644
--- a/rtl837x_stp.c
+++ b/rtl837x_stp.c
@@ -35,16 +35,6 @@ __xdata uint16_t port_timers[10];
 __xdata uint16_t port_hello[10];
 
 
-// 8899 04 0000 20 0004
-struct rtl_tag {
-	uint16_t tag;
-	uint8_t version;
-	uint16_t dummy;
-	uint8_t flag;
-	uint16_t pmask;
-};
-
-
 struct stp_pkt {
 	uint8_t stp_addr[6];
 	uint8_t src_addr[6];