diff --git a/UI/SidePanel.cpp b/UI/SidePanel.cpp
index d4567927692..2899561ad36 100644
--- a/UI/SidePanel.cpp
+++ b/UI/SidePanel.cpp
@@ -589,7 +589,6 @@ class SidePanel::PlanetPanelContainer : public GG::Wnd {
     void            DisableNonSelectionCandidates();    //!< disables planet panels that aren't selection candidates
 
     void            PlanetLeftClicked(int planet_id);   //!< responds to user clicking a planet panel.  emits PlanetSelectedSignal
-    void            PlanetLeftDoubleClicked(int planet_id); //!< responds to user double-clicking a planet panel
     void            DoPanelsLayout();                   //!< repositions PlanetPanels, without moving top panel.  Panels below may shift if ones above them have resized.
     void            DoLayout();