diff --git a/changelog.txt b/changelog.txt
index 473223c..dee2f7d 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.18.3
+Date: 2020-03-21
+  Bugfixes:
+    - Added missing initialization of turret index
+---------------------------------------------------------------------------------------------------
 Version: 0.18.2
 Date: 2020-03-20
   Changes:
diff --git a/control.lua b/control.lua
index 553b453..46b025a 100644
--- a/control.lua
+++ b/control.lua
@@ -4,9 +4,9 @@
 script.on_event({defines.events.on_tick}, function (event)
 	--Every minute the surface is rescanned for ammo-turret type entities. This is stored in the global table. 
 	if event.tick%3600 == 0 or global.turret_entities == nil then
-		local planet = game.surfaces
-		for index,_ in pairs(planet) do
-			global.turret_entities[index] = planet[index].find_entities_filtered{type = "ammo-turret"}
+		global.turret_entities = {}
+		for index,surface in pairs(game.surfaces) do
+			global.turret_entities[index] = surface.find_entities_filtered{type = "ammo-turret"}
 		end
 	end
 	if event.tick%600 == 0 then
diff --git a/info.json b/info.json
index 40c19f6..2a07e2c 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "Gun_Turret_Alerts",
-    "version": "0.18.2",
+    "version": "0.18.3",
     "title": "Gun_Turret_Alerts",
     "author": "Wyrrrd",
     "factorio_version": "0.18",