diff --git a/misc_gui.c b/misc_gui.c
index 315bab533f..10f53f7017 100644
--- a/misc_gui.c
+++ b/misc_gui.c
@@ -1876,7 +1876,7 @@ void ShowCheatWindow(void)
  * @param horizontal Tells how far to the right the widgets should be moved (note: negative moves left)
  * @param vertical Tells how far down the widgets should be moved (note: negative moves up)
 */
-void ResizeWindowWidgets(Window *w, const byte *resizearray, byte length, byte horizontal, byte vertical)
+void ResizeWindowWidgets(Window *w, const byte *resizearray, int16 length, byte horizontal, int16 vertical)
 {
 	byte i;
 
diff --git a/resize_window_widgets.h b/resize_window_widgets.h
index a593e45b0a..047d0d45b5 100644
--- a/resize_window_widgets.h
+++ b/resize_window_widgets.h
@@ -26,6 +26,6 @@ enum {
 	WIDGET_MOVE_DOWN_STRETCH_RIGHT = WIDGET_MOVE_DOWN  | WIDGET_STRETCH_RIGHT,
 };
 
-void ResizeWindowWidgets(Window *w, const byte *resizearray, byte length, byte horizontal, byte vertical);
+void ResizeWindowWidgets(Window *w, const byte *resizearray, int16 length, byte horizontal, int16 vertical);
 
 #endif