diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 0fda561818..302908e800 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -34,6 +34,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <debug.h>
+#include <spawn.h>
 
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>