diff --git a/include/macros.h b/include/macros.h
index 7ace58e..7b904fe 100644
--- a/include/macros.h
+++ b/include/macros.h
@@ -17,6 +17,8 @@
 #define MIB (1024 * KIB)
 #define GIB (1024 * MIB)
 
+#define count_of(x) (sizeof(x) / sizeof(*(x)))
+
 #define container_of(ptr, type, member) \
 	(type *)((char *)ptr - offsetof(type, member))