diff --git a/examples/mifare-classic-format.c b/examples/mifare-classic-format.c
index 0930662..36997be 100644
--- a/examples/mifare-classic-format.c
+++ b/examples/mifare-classic-format.c
@@ -17,6 +17,8 @@
  * $Id$
  */
 
+#include "config.h"
+
 #include <err.h>
 #include <errno.h>
 #include <stdlib.h>