diff --git a/lib_m68k/board.c b/lib_m68k/board.c
index 6ef8b91..06b3bd5 100644
--- a/lib_m68k/board.c
+++ b/lib_m68k/board.c
@@ -577,7 +577,7 @@
 	 */
 	timer_init();
 
-#if CONFIG_SERIAL_SOFTWARE_FIFO
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
 	serial_buffered_init();
 #endif