diff --git a/megamek/src/megamek/client/ui/swing/widget/DetachablePane.java b/megamek/src/megamek/client/ui/swing/widget/DetachablePane.java
index c57446608f1..4da9e6630e1 100644
--- a/megamek/src/megamek/client/ui/swing/widget/DetachablePane.java
+++ b/megamek/src/megamek/client/ui/swing/widget/DetachablePane.java
@@ -135,7 +135,7 @@ public void actionPerformed(ActionEvent e) {
         this.window = new JFrame();
         this.window.addWindowListener(new WindowAdapter() {
                 @Override
-                public void windowClosing​(WindowEvent e) {
+                public void windowClosing(WindowEvent e) {
                     attachPane();
                 }
             });