diff --git a/examples/blink-io.c b/examples/blink-io.c
index c495df6..bfde0cb 100644
--- a/examples/blink-io.c
+++ b/examples/blink-io.c
@@ -26,6 +26,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <signal.h>
+#include <stdlib.h>
 
 #include "gpio.h"