diff --git a/code/modules/cm_aliens/structures/trap.dm b/code/modules/cm_aliens/structures/trap.dm
index 5e76881e6fac..73d3602d85fd 100644
--- a/code/modules/cm_aliens/structures/trap.dm
+++ b/code/modules/cm_aliens/structures/trap.dm
@@ -349,6 +349,7 @@
 		HasProximity(A)
 
 /obj/effect/alien/resin/trap/proc/on_shuttle_crushing()
+	SIGNAL_HANDLER
 	UnregisterSignal(src, COMSIG_MOVABLE_SHUTTLE_CRUSH)
 	loc = null