diff --git a/drivers/serial/serial_io.c b/drivers/serial/serial_io.c
index 97a31bb4811..99d46296696 100644
--- a/drivers/serial/serial_io.c
+++ b/drivers/serial/serial_io.c
@@ -45,6 +45,7 @@
 
 #include <sys/types.h>
 #include <stdint.h>
+#include <signal.h>
 #include <semaphore.h>
 #include <debug.h>