diff --git a/code/__DEFINES/dcs/signals.dm b/code/__DEFINES/dcs/signals.dm
index 583d1a954..32ec833bd 100644
--- a/code/__DEFINES/dcs/signals.dm
+++ b/code/__DEFINES/dcs/signals.dm
@@ -191,6 +191,7 @@
 #define COMSIG_CLICK_CTRL_SHIFT "ctrl_shift_click"				//from base of atom/CtrlShiftClick(/mob)
 #define COMSIG_MOUSEDROP_ONTO "mousedrop_onto"					//from base of atom/MouseDrop(): (/atom/over, /mob/user)
 	#define COMPONENT_NO_MOUSEDROP 1
+#define COMSIG_MOUSEDROPPED_ONTO "mousedropped_onto"
 
 
 #define COMSIG_MICRO_PICKUP_FEET "micro_force_grabbed"			//From /datum/element/mob_holder/micro