diff --git a/src/gui.h b/src/gui.h
--- a/src/gui.h
+++ b/src/gui.h
@@ -48,6 +48,7 @@ void ShowAboutWindow();
 void ShowBuildTreesToolbar();
 void ShowTownDirectory();
 void ShowIndustryDirectory();
+void ShowIndustryCargoesWindow();
 void ShowSubsidiesList();
 void ShowGoalsList();
 void ShowGoalQuestion(uint16 id, byte type, uint32 button_mask, const char *question);