diff --git a/openrtx/include/core/utils.h b/openrtx/include/core/utils.h
index 08dee873..e2cd6af2 100644
--- a/openrtx/include/core/utils.h
+++ b/openrtx/include/core/utils.h
@@ -28,6 +28,14 @@
 extern "C" {
 #endif
 
+/**
+ * Get the number of elements of an array.
+ *
+ * @param x: array.
+ * @return number of elements.
+ */
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
 /**
  * This function allows to obtain the value of a given calibration parameter for
  * frequencies outside the calibration points. It works by searching the two