diff --git a/Upgrade.lua b/Upgrade.lua
index 9b6bc8c..5e1666b 100644
--- a/Upgrade.lua
+++ b/Upgrade.lua
@@ -5,6 +5,8 @@ local upgrade = {}
 local constants = require("libs/Constants")
 local chunkProcessor = require("libs/ChunkProcessor")
 local mapUtils = require("libs/MapUtils")
+local chunkPropertyUtils = require("libs/ChunkUtils")
+local baseUtils = require("libs/BaseUtils")
 
 -- constants
 
@@ -28,6 +30,13 @@ local TRIPLE_CHUNK_SIZE = constants.TRIPLE_CHUNK_SIZE
 
 -- imported functions
 
+local getChunkById = mapUtils.getChunkById
+local setChunkBase = chunkPropertyUtils.setChunkBase
+
+local createBase = baseUtils.createBase
+local findNearbyBase = baseUtils.findNearbyBase
+
+
 local sFind = string.find
 local queueGeneratedChunk = mapUtils.queueGeneratedChunk
 local processPendingChunks = chunkProcessor.processPendingChunks
@@ -522,7 +531,26 @@ function upgrade.attempt(universe)
         global.version = 205
 
         addCommandSet(universe)
-        game.print("Rampant - Version 2.0.1")
+    end
+    if global.version < 206 then
+        global.version = 206
+
+        if universe.NEW_ENEMIES then
+            local tick = game.tick
+            for chunkId, chunkPack in pairs(universe.chunkToNests) do
+                local map = chunkPack.map
+                if map.surface.valid then
+                    local chunk = getChunkById(map, chunkId)
+                    local base = findNearbyBase(map, chunk)
+                    if not base then
+                        base = createBase(map, chunk, tick)
+                    end
+                    setChunkBase(map, chunk, base)
+                end
+            end
+        end
+
+        game.print("Rampant - Version 2.0.2")
     end
 
     return (starting ~= global.version) and global.version
diff --git a/changelog.txt b/changelog.txt
index 002536f..d02c252 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,9 @@
+---------------------------------------------------------------------------------------------------
+Version: 2.0.2
+Date: 15. 12. 2021
+  Bugfixes:
+    - Fixed base missing in unregisteredEnemyStructure with Rampant already active in a save before enabling new enemies
+
 ---------------------------------------------------------------------------------------------------
 Version: 2.0.1
 Date: 23. 11. 2021
diff --git a/control.lua b/control.lua
index 0105c4a..3160741 100644
--- a/control.lua
+++ b/control.lua
@@ -37,6 +37,9 @@ local RETREAT_SPAWNER_GRAB_RADIUS = constants.RETREAT_SPAWNER_GRAB_RADIUS
 
 -- imported functions
 
+local getChunkById = mapUtils.getChunkById
+local setChunkBase = chunkPropertyUtils.setChunkBase
+
 local setPointAreaInQuery = queryUtils.setPointAreaInQuery
 local setPositionInQuery = queryUtils.setPositionInQuery
 
@@ -254,6 +257,7 @@ local function onConfigChanged()
 
     universe["ENEMY_SEED"] = settings.startup["rampant--enemySeed"].value
     universe["ENEMY_VARIATIONS"] = settings.startup["rampant--newEnemyVariations"].value
+    local usingNewEnemiesAlready = universe["NEW_ENEMIES"]
     universe["NEW_ENEMIES"] = settings.startup["rampant--newEnemies"].value
 
     if universe.NEW_ENEMIES then
@@ -292,6 +296,20 @@ local function onConfigChanged()
             prepMap(universe, surface)
         end
     end
+    if (not usingNewEnemiesAlready) and universe.NEW_ENEMIES then
+        local tick = game.tick
+        for chunkId, chunkPack in pairs(universe.chunkToNests) do
+            local map = chunkPack.map
+            if map.surface.valid then
+                local chunk = getChunkById(map, chunkId)
+                local base = findNearbyBase(map, chunk)
+                if not base then
+                    base = createBase(map, chunk, tick)
+                end
+                setChunkBase(map, chunk, base)
+            end
+        end
+    end
 end
 
 local function onBuild(event)
diff --git a/info.json b/info.json
index 074baec..7eff974 100644
--- a/info.json
+++ b/info.json
@@ -1,7 +1,7 @@
 {
     "name" : "Rampant",
     "factorio_version" : "1.1",
-    "version" : "2.0.1",
+    "version" : "2.0.2",
     "title" : "Rampant",
     "author" : "Veden",
     "homepage" : "https://forums.factorio.com/viewtopic.php?f=94&t=31445",