diff --git a/code/_onclick/hud/action_button.dm b/code/_onclick/hud/action_button.dm
index 562f304f24..f5826579c8 100644
--- a/code/_onclick/hud/action_button.dm
+++ b/code/_onclick/hud/action_button.dm
@@ -59,7 +59,7 @@
 
 // Entered and Exited won't fire while you're dragging something, because you're still "holding" it
 // Very much byond logic, but I want nice behavior, so we fake it with drag
-/atom/movable/screen/movable/action_button/MouseDrag(atom/over_object, src_location, over_location, src_control, over_control, params)
+/atom/movable/screen/movable/action_button/MouseDrag(atom/over_object, atom/src_location, atom/over_location, src_control, over_control, params)
 	. = ..()
 	if(!can_use(usr))
 		return