diff --git a/mighttpd2.cabal b/mighttpd2.cabal
--- a/mighttpd2.cabal
+++ b/mighttpd2.cabal
@@ -1,5 +1,5 @@
 Name:                   mighttpd2
-Version:                3.4.1
+Version:                3.4.2
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -67,6 +67,7 @@
   if flag(tls)
     Cpp-Options:        -DHTTP_OVER_TLS
     Build-Depends:      async
+                      , tls-session-manager
   Build-Depends:        base >= 4.0 && < 5
                       , bytestring
                       , directory
@@ -88,8 +89,7 @@
   if flag(tls)
     Build-Depends:      tls
                       , warp-tls >= 3.2 && < 3.3
-  Other-Modules:        Mighty
-                        Server
+  Other-Modules:        Server
                         WaiApp
                         Paths_mighttpd2
 
diff --git a/src/Server.hs b/src/Server.hs
--- a/src/Server.hs
+++ b/src/Server.hs
@@ -6,8 +6,10 @@
 import Control.Exception (try)
 import Control.Monad (unless, when)
 import qualified Data.ByteString.Char8 as BS
+#ifdef HTTP_OVER_TLS
 import Data.Char (isSpace)
 import Data.List (dropWhile, dropWhileEnd, break)
+#endif
 import Data.Streaming.Network (bindPortTCP)
 import Network (Socket, sClose)
 import qualified Network.HTTP.Client as H
@@ -29,6 +31,7 @@
 import Control.Concurrent.Async (concurrently)
 import Control.Monad (void)
 import Network.Wai.Handler.WarpTLS
+import Network.TLS.SessionManager
 #else
 data TLSSettings = TLSSettings
 #endif
@@ -137,7 +140,11 @@
                     chain_files = map strip $ split $ opt_tls_chain_files _opt
                 chains <- mapM BS.readFile chain_files
                 key  <- BS.readFile $ opt_tls_key_file _opt
-                return $ tlsSettingsChainMemory cert chains key
+                let settings0 = tlsSettingsChainMemory cert chains key
+                    settings = settings0 {
+                        tlsSessionManagerConfig = Just defaultConfig
+                      }
+                return settings
 #else
     return TLSSettings
 #endif