diff --git a/monitoring/unit/mem.go b/monitoring/unit/mem.go
index 4926398..1b8f7e2 100644
--- a/monitoring/unit/mem.go
+++ b/monitoring/unit/mem.go
@@ -24,7 +24,7 @@ func Ram() RamInfo {
 		return raminfo
 	}
 	raminfo.Total = v.Total
-	raminfo.Used = v.Used
+	raminfo.Used = v.Total - v.Available
 
 	return raminfo
 }