diff --git a/uloop.c b/uloop.c
index a28bce8..88e9c81 100644
--- a/uloop.c
+++ b/uloop.c
@@ -32,6 +32,7 @@
 #include <stdbool.h>
 
 #include "uloop.h"
+#include "utils.h"
 
 #ifdef USE_KQUEUE
 #include <sys/event.h>
@@ -41,10 +42,6 @@
 #endif
 #include <sys/wait.h>
 
-
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-#endif
 #define ULOOP_MAX_EVENTS 10
 
 static struct list_head timeouts = LIST_HEAD_INIT(timeouts);
diff --git a/utils.h b/utils.h
index e56998d..065a28b 100644
--- a/utils.h
+++ b/utils.h
@@ -34,4 +34,8 @@
 
 void *__calloc_a(size_t len, ...);
 
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+#endif
+
 #endif