diff --git a/tests/string-test.c b/tests/string-test.c
index a72ec30f..5571b528 100644
--- a/tests/string-test.c
+++ b/tests/string-test.c
@@ -28,6 +28,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <assert.h>
 
 #include "shared/string-helpers.h"