diff --git a/include/ucore/utils.h b/include/ucore/utils.h
index f04410b..9adb19f 100644
--- a/include/ucore/utils.h
+++ b/include/ucore/utils.h
@@ -107,13 +107,13 @@ if (!(expr) ) {\
 #define UC_ROUND_UP(x, y) (((x) / (y)) * (y))
 
 /**
- * Round x up to nearest multiple of y
+ * Round x down to nearest multiple of y
  *
  * @param x numerator, must be positive
  * @param y denominator
  * @return x rounded to nearest multiple of y
  */
-#define UC_ROUND_UP(x, y) (UC_DIV_ROUND_UP((x),(y)) * (y))
+#define UC_ROUND_DOWN(x, y) ((x) / (y) * (y))
 
 
 #endif