diff --git a/test/check_an_array.c b/test/check_an_array.c
index 0ddefe5..6bd9fb1 100644
--- a/test/check_an_array.c
+++ b/test/check_an_array.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h>
 
 #include "an_array.h"