diff --git a/lib_arm/board.c b/lib_arm/board.c
index 22d573a39834e1c2a813bf73c672e3818b8b4660..67506b35e1ec6fbac0d00ee000341dc97c345414 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -44,6 +44,7 @@
 #include <devices.h>
 #include <version.h>
 #include <net.h>
+#include <serial.h>
 
 #ifdef CONFIG_DRIVER_SMC91111
 #include "../drivers/net/smc91111.h"
diff --git a/lib_m68k/board.c b/lib_m68k/board.c
index 915920641dba42de9a5dd31c421d5f162e2d6849..6654f971b24130b96b81174307eb99d21e60e10f 100644
--- a/lib_m68k/board.c
+++ b/lib_m68k/board.c
@@ -45,6 +45,7 @@
 #include <status_led.h>
 #endif
 #include <net.h>
+#include <serial.h>
 #if defined(CONFIG_CMD_BEDBUG)
 #include <cmd_bedbug.h>
 #endif