diff --git a/dock_gui.c b/dock_gui.c
--- a/dock_gui.c
+++ b/dock_gui.c
@@ -204,6 +204,7 @@ static const WindowDesc _build_docks_too
 
 void ShowBuildDocksToolbar()
 {
+	if (_current_player == OWNER_SPECTATOR) return;
 	DeleteWindowById(WC_BUILD_TOOLBAR, 0);
 	AllocateWindowDesc(&_build_docks_toolbar_desc);
 }