diff --git a/linux_termios.h b/linux_termios.h
index e7c86e7..213d7c5 100644
--- a/linux_termios.h
+++ b/linux_termios.h
@@ -21,6 +21,7 @@
 #define LIBSERIALPORT_LINUX_TERMIOS_H
 
 #include <stdlib.h>
+#include "config.h"
 
 SP_PRIV unsigned long get_termios_get_ioctl(void);
 SP_PRIV unsigned long get_termios_set_ioctl(void);