1 files changed, 1 insertions, 0 deletions
diff --git a/src/window_func.h b/src/window_func.h
index 4d21c4192..b61359900 100644
--- a/src/window_func.h
+++ b/src/window_func.h
@@ -16,6 +16,7 @@
 #include "company_type.h"
 
 Window *FindWindowById(WindowClass cls, WindowNumber number);
+Window *FindWindowByClass(WindowClass cls);
 void ChangeWindowOwner(Owner old_owner, Owner new_owner);
 
 void ResizeWindow(Window *w, int x, int y);