diff --git a/SteamWareLib/pieChart.cs b/SteamWareLib/pieChart.cs
index 00cd1d5..93a2c02 100644
--- a/SteamWareLib/pieChart.cs
+++ b/SteamWareLib/pieChart.cs
@@ -214,9 +214,9 @@ namespace SteamWare
                 output.Write(drawLegend());
             }
             output.Write("</td></tr></table>");
-            // pulisco cache files di ieri... 
+            // pulisco cache files + vecchi di 1 h... 
             fileMover fm = new fileMover("./WebCharts/", "./logs/");
-            foreach (DataLayer_generic.filesRow riga in fm.elencoFiles("png"))
+            foreach (DataLayer_generic.filesRow riga in fm.elencoFiles("*.png"))
             {
                 if (riga.dataCreaz <= DateTime.Now.AddHours(-1))
                 {