diff --git a/GCSViews/FlightData.cs b/GCSViews/FlightData.cs
index 9b222c49ce..d4af7a93d8 100644
--- a/GCSViews/FlightData.cs
+++ b/GCSViews/FlightData.cs
@@ -4083,7 +4083,7 @@ private void mainloop()
 
                                     adsbplane.ToolTipText = "ICAO: " + pllau.Tag + "\n" +
                                                             "Callsign: " + pllau.CallSign + "\n" +
-                                                            "Squawk: " + pllau.Squawk.ToString("X4") + "\n" +
+                                                            "Squawk: " + pllau.Squawk.ToString("0") + "\n" +
                                                             "Alt: " + (pllau.Alt * CurrentState.multiplieralt).ToString("0") + " " + CurrentState.AltUnit + "\n" +
                                                             "Speed: " + (pllau.Speed / 100 /* cm to m */ * CurrentState.multiplierspeed).ToString("0") + " " + CurrentState.SpeedUnit + "\n" +
                                                             "VSpeed: " + (pllau.VerticalSpeed / 100 /* cm to m */ * CurrentState.multiplierspeed).ToString("F1") + " " + CurrentState.SpeedUnit + "\n" +