diff --git a/code/modules/power/apc.dm b/code/modules/power/apc.dm
index 2a2bdd45151..62c7d8cf3c3 100644
--- a/code/modules/power/apc.dm
+++ b/code/modules/power/apc.dm
@@ -775,7 +775,7 @@
 		ui.open()
 
 /obj/machinery/power/apc/tgui_data(mob/user)
-	var/data[0]
+	var/list/data = list()
 	data["locked"] = is_locked(user)
 	data["normallyLocked"] = locked
 	data["isOperating"] = operating