diff --git a/McBitFont/Form1.cs b/McBitFont/Form1.cs
index 56d8659..05addd3 100644
--- a/McBitFont/Form1.cs
+++ b/McBitFont/Form1.cs
@@ -1090,6 +1090,7 @@ namespace McBitFont {
         }
 
         private void MainForm_FormClosing(object sender, FormClosingEventArgs e) {
+            CheckModifiedFrame();
             if (prjModified) {
                 if (MessageBox.Show("The project is modified.\nAre you sure you want to quit?", "Are you sure?", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No) {
                     e.Cancel = true;