diff --git a/ubus_common.h b/ubus_common.h
index 5e4d0ad..502e5c4 100644
--- a/ubus_common.h
+++ b/ubus_common.h
@@ -14,13 +14,11 @@
 #ifndef __UBUS_COMMON_H
 #define __UBUS_COMMON_H
 
+#include <stdbool.h>
+
 #define UBUS_SIGNATURE_METHOD	(BLOBMSG_TYPE_LAST + 1)
 #define UBUS_SIGNATURE_END		(BLOBMSG_TYPE_LAST + 2)
 
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#endif
-
 static inline bool ubus_strmatch_len(const char *s1, const char *s2, int *len)
 {
 	for (*len = 0; s1[*len] == s2[*len]; (*len)++)