diff --git a/src/newgrf_debug_gui.cpp b/src/newgrf_debug_gui.cpp
--- a/src/newgrf_debug_gui.cpp
+++ b/src/newgrf_debug_gui.cpp
@@ -45,7 +45,7 @@
 #include "safeguards.h"
 
 /** The sprite picker. */
-NewGrfDebugSpritePicker _newgrf_debug_sprite_picker = { SPM_NONE, nullptr, 0, std::vector<SpriteID>() };
+NewGrfDebugSpritePicker _newgrf_debug_sprite_picker = { SPM_NONE, nullptr, std::vector<SpriteID>() };
 
 /**
  * Get the feature index related to the window number.