diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+- 0.12.2.0 (2017-07-28)
+    * Don't use LambdaCase, we want to support older GHC versions
+
 - 0.12.1.0 (2017-07-22)
     * Fix Monoid import on older base versions
     * Increase lower bound on `binary` to 0.8.1 (by Jonathan Daugherty)
diff --git a/src/Network/WebSockets/Extensions/PermessageDeflate.hs b/src/Network/WebSockets/Extensions/PermessageDeflate.hs
--- a/src/Network/WebSockets/Extensions/PermessageDeflate.hs
+++ b/src/Network/WebSockets/Extensions/PermessageDeflate.hs
@@ -1,5 +1,4 @@
 --------------------------------------------------------------------------------
-{-# LANGUAGE LambdaCase        #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards   #-}
 {-# LANGUAGE TupleSections     #-}
@@ -224,7 +223,7 @@
 
 --------------------------------------------------------------------------------
 dePopper :: Zlib.Popper -> IO BL.ByteString
-dePopper p = p >>= \case
+dePopper p = p >>= \res -> case res of
     Zlib.PRDone    -> return BL.empty
     Zlib.PRNext c  -> BL.chunk c <$> dePopper p
     Zlib.PRError x -> throwIO $ CloseRequest 1002 (BL8.pack (show x))
diff --git a/websockets.cabal b/websockets.cabal
--- a/websockets.cabal
+++ b/websockets.cabal
@@ -1,5 +1,5 @@
 Name:    websockets
-Version: 0.12.1.0
+Version: 0.12.2.0
 
 Synopsis:
   A sensible and clean way to write WebSocket-capable servers in Haskell.