diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 4176e25..6e374f2 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -31,6 +31,8 @@
 
 #include <serial.h>
 
+#ifndef CONFIG_NS16550_MIN_FUNCTIONS
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #if !defined(CONFIG_CONS_INDEX)
@@ -262,3 +264,5 @@ void ns16550_serial_initialize(void)
 	serial_register(&eserial4_device);
 #endif
 }
+
+#endif /* !CONFIG_NS16550_MIN_FUNCTIONS */