diff --git a/plugins/inputs/system/ps.go b/plugins/inputs/system/ps.go
index ab4b86743..065f8284b 100644
--- a/plugins/inputs/system/ps.go
+++ b/plugins/inputs/system/ps.go
@@ -154,7 +154,7 @@ func (s *SystemPS) DiskUsage(
 		du, err := s.PSDiskUsage(mountpoint)
 		if err != nil {
 			if s.Log != nil {
-				s.Log.Errorf("[SystemPS] => error getting disk usage (%q): %v", mountpoint, err)
+				s.Log.Debugf("[SystemPS] => unable to get disk usage (%q): %v", mountpoint, err)
 			}
 			continue
 		}