diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,8 @@
+## 3.2.4
+
+* Avoid unnecessary copy for Text values with text-2.0
+  [#219](https://github.com/kazu-yamamoto/logger/pull/219)
+
 ## 3.2.3
 
 * Ensuring flush for single logger.
diff --git a/System/Log/FastLogger/LogStr.hs b/System/Log/FastLogger/LogStr.hs
--- a/System/Log/FastLogger/LogStr.hs
+++ b/System/Log/FastLogger/LogStr.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE Safe #-}
+{-# LANGUAGE Trustworthy #-}
 
 module System.Log.FastLogger.LogStr (
     Builder
@@ -24,6 +24,9 @@
 import Data.String (IsString(..))
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as T
+#if MIN_VERSION_text(2,0,0)
+import qualified Data.Text.Foreign as T
+#endif
 import qualified Data.Text.Lazy as TL
 import qualified Data.Text.Lazy.Encoding as TL
 
@@ -89,11 +92,18 @@
     toLogStr = toLogStr . TL.pack
 instance ToLogStr T.Text where
     {-# INLINE toLogStr #-}
+#if MIN_VERSION_text(2,0,0)
+    toLogStr t = LogStr (T.lengthWord8 t) (T.encodeUtf8Builder t)
+#else
     toLogStr = toLogStr . T.encodeUtf8
+#endif
 instance ToLogStr TL.Text where
     {-# INLINE toLogStr #-}
+#if MIN_VERSION_text(2,0,0)
+    toLogStr t = LogStr (TL.foldlChunks (\n c -> T.lengthWord8 c + n) 0 t) (TL.encodeUtf8Builder t)
+#else
     toLogStr = toLogStr . TL.encodeUtf8
-
+#endif
 -- | @since 2.4.14
 instance ToLogStr Int where
     {-# INLINE toLogStr #-}
diff --git a/fast-logger.cabal b/fast-logger.cabal
--- a/fast-logger.cabal
+++ b/fast-logger.cabal
@@ -1,6 +1,6 @@
 cabal-version:      >=1.10
 name:               fast-logger
-version:            3.2.3
+version:            3.2.4
 license:            BSD3
 license-file:       LICENSE
 maintainer:         Kazu Yamamoto <kazu@iij.ad.jp>