diff --git a/src/RageUtil/Utils/RageUtil.h b/src/RageUtil/Utils/RageUtil.h
index 523a36fb20..5177ecd4b6 100644
--- a/src/RageUtil/Utils/RageUtil.h
+++ b/src/RageUtil/Utils/RageUtil.h
@@ -29,7 +29,7 @@ class RageFileDriver;
 #define ZERO(x) memset(&(x), 0, sizeof(x))
 
 /** @brief Get the length of the array. */
-#define ARRAYLEN(a) (sizeof(a) / sizeof((a)[0]))
+#define ARRAYLEN(a) std::size(a)
 
 /**
  * @brief Scales x so that l1 corresponds to l2 and h1 corresponds to h2.