diff --git a/mem/mem_linux.go b/mem/mem_linux.go
index fe6c4e1..33b2490 100644
--- a/mem/mem_linux.go
+++ b/mem/mem_linux.go
@@ -70,8 +70,8 @@ func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
 	if !memavail {
 		ret.Available = ret.Free + ret.Buffers + ret.Cached
 	}
-	ret.Used = ret.Total - ret.Available
-	ret.UsedPercent = float64(ret.Total-ret.Available) / float64(ret.Total) * 100.0
+	ret.Used = ret.Total - ret.Free - ret.Buffers - ret.Cached
+	ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
 
 	return ret, nil
 }