diff --git a/tests/iodelay.cpp b/tests/iodelay.cpp
index 1ef470fd..f5c58364 100644
--- a/tests/iodelay.cpp
+++ b/tests/iodelay.cpp
@@ -20,6 +20,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#define __STDC_LIMIT_MACROS
 #include <stdint.h>
 #include <math.h>
 #include <unistd.h>