diff --git a/src/common/sysdefs.h b/src/common/sysdefs.h
index 7b69504c..8ebe476f 100644
--- a/src/common/sysdefs.h
+++ b/src/common/sysdefs.h
@@ -154,4 +154,8 @@ typedef unsigned char _Bool;
 #	define MAX(x, y) ((x) > (y) ? (x) : (y))
 #endif
 
+#ifndef ARRAY_SIZE
+#	define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
+#endif
+
 #endif