diff --git a/plugins/system/ps.go b/plugins/system/ps.go
index 687ccdf7e..0bf67011b 100644
--- a/plugins/system/ps.go
+++ b/plugins/system/ps.go
@@ -78,11 +78,10 @@ func (s *systemPS) DiskUsage() ([]*disk.DiskUsageStat, error) {
 
 	for _, p := range parts {
 		du, err := disk.DiskUsage(p.Mountpoint)
-		du.Fstype = p.Fstype
 		if err != nil {
 			return nil, err
 		}
-
+		du.Fstype = p.Fstype
 		usage = append(usage, du)
 	}