diff --git a/board/compulab/cm_t35/cm_t35.c b/board/compulab/cm_t35/cm_t35.c
index 3b963183bebad93ba0dec941091a753e33487d9c..886c7239005a9dc323c67fe6c9fef5be2879c563 100644
--- a/board/compulab/cm_t35/cm_t35.c
+++ b/board/compulab/cm_t35/cm_t35.c
@@ -457,16 +457,6 @@ int board_eth_init(bd_t *bis)
 }
 #endif
 
-void __weak get_board_serial(struct tag_serialnr *serialnr)
-{
-	/*
-	 * This corresponds to what happens when we can communicate with the
-	 * eeprom but don't get a valid board serial value.
-	 */
-	serialnr->low = 0;
-	serialnr->high = 0;
-};
-
 #ifdef CONFIG_USB_EHCI_OMAP
 struct omap_usbhs_board_data usbhs_bdata = {
 	.port_mode[0] = OMAP_EHCI_PORT_MODE_PHY,
diff --git a/board/compulab/common/common.c b/board/compulab/common/common.c
index f2ce522fa68535a9685f1da4420c3f3e75d81c41..b25d9a20b40321e2c9e91f7c3627e6076c6f3d1c 100644
--- a/board/compulab/common/common.c
+++ b/board/compulab/common/common.c
@@ -25,6 +25,18 @@ void cl_print_pcb_info(void)
 	printf("PCB:   %u.%u\n", rev_major, rev_minor);
 }
 
+#ifdef CONFIG_SERIAL_TAG
+void __weak get_board_serial(struct tag_serialnr *serialnr)
+{
+	/*
+	 * This corresponds to what happens when we can communicate with the
+	 * eeprom but don't get a valid board serial value.
+	 */
+	serialnr->low = 0;
+	serialnr->high = 0;
+};
+#endif
+
 #ifdef CONFIG_CMD_USB
 int cl_usb_hub_init(int gpio, const char *label)
 {