diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # ChangeLog for auto-update
 
+## 0.2.6
+
+* Using the thread version of AutoUpdate for non-threaded RTS.
+  [#1020](https://github.com/yesodweb/wai/pull/1020)
+
 ## 0.2.5
 
 * Thread less autoupdate
diff --git a/Control/AutoUpdate.hs b/Control/AutoUpdate.hs
--- a/Control/AutoUpdate.hs
+++ b/Control/AutoUpdate.hs
@@ -45,9 +45,26 @@
 )
 where
 
+import Control.AutoUpdate.Types
 #ifdef mingw32_HOST_OS
 import Control.AutoUpdate.Thread
 #else
-import Control.AutoUpdate.Event
+import qualified Control.AutoUpdate.Event as Event
+import qualified Control.AutoUpdate.Thread as Thread
+
+import GHC.Event
+
+mkAutoUpdate :: UpdateSettings a -> IO (IO a)
+mkAutoUpdate settings = do
+    mmgr <- getSystemEventManager
+    case mmgr of
+      Nothing -> Thread.mkAutoUpdate settings
+      Just _m -> Event.mkAutoUpdate settings
+
+mkAutoUpdateWithModify :: UpdateSettings a -> (a -> IO a) -> IO (IO a)
+mkAutoUpdateWithModify settings f = do
+    mmgr <- getSystemEventManager
+    case mmgr of
+      Nothing -> Thread.mkAutoUpdateWithModify settings f
+      Just _m -> Event.mkAutoUpdateWithModify settings f
 #endif
-import Control.AutoUpdate.Types
diff --git a/auto-update.cabal b/auto-update.cabal
--- a/auto-update.cabal
+++ b/auto-update.cabal
@@ -1,5 +1,5 @@
 name:                auto-update
-version:             0.2.5
+version:             0.2.6
 synopsis:            Efficiently run periodic, on-demand actions
 description:         API docs and the README are available at <http://www.stackage.org/package/auto-update>.
 homepage:            https://github.com/yesodweb/wai
@@ -21,9 +21,8 @@
                        Control.Reaper
                        Control.Reaper.Internal
   other-modules:       Control.AutoUpdate.Types
-  if os(windows)
-    other-modules:     Control.AutoUpdate.Thread
-  else
+                       Control.AutoUpdate.Thread
+  if !os(windows)
     exposed-modules:   Control.AutoUpdate.Internal
     other-modules:     Control.AutoUpdate.Event
   build-depends:       base >= 4.12 && < 5,