diff --git a/pk3DS/Subforms/RSTE.Designer.cs b/pk3DS/Subforms/RSTE.Designer.cs
index 207dbf3..8d3619f 100644
--- a/pk3DS/Subforms/RSTE.Designer.cs
+++ b/pk3DS/Subforms/RSTE.Designer.cs
@@ -2067,6 +2067,7 @@ private void InitializeComponent()
             this.MaximizeBox = false;
             this.Name = "RSTE";
             this.Text = "Trainer Editor";
+            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.formClosing);
             this.tabControl1.ResumeLayout(false);
             this.tabPage1.ResumeLayout(false);
             this.tabPage1.PerformLayout();
diff --git a/pk3DS/Subforms/RSTE.cs b/pk3DS/Subforms/RSTE.cs
index e4673b5..97ec851 100644
--- a/pk3DS/Subforms/RSTE.cs
+++ b/pk3DS/Subforms/RSTE.cs
@@ -957,5 +957,10 @@ private int GetRandomMegaEvolvablePokemon(int type)
             List<int> valids = megaEvos.Where(spec => (int)personal[spec][6] == type || (int)personal[spec][7] == type).ToList();
             return valids[(int)(rnd32() % valids.Count)];
         }
+
+        private void formClosing(object sender, FormClosingEventArgs e)
+        {
+            writeFile();
+        }
     }
 }
\ No newline at end of file