diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8a7e13a..c63a062 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,6 +8,12 @@ orbs:
 workflows:
   multiple-ghc-build:
     jobs:
+      - haskell/build-with-binary-cache:
+          name: GHC 8.2.2
+          executor: haskell/ghc-8_2_2
+          context: haskell-ci
+          binary-cache-uri: ${BINARY_CACHE_URI-"http://hw-binary-cache-us-west-2-a.s3-website-us-west-2.amazonaws.com/archive"}
+
       - haskell/build-with-binary-cache:
           name: GHC 8.4.4
           executor: haskell/ghc-8_4_4
@@ -30,6 +36,7 @@ workflows:
           name: GitHub Release
           context: haskell-ci
           requires:
+            - GHC 8.2.2
             - GHC 8.4.4
             - GHC 8.6.5
             - GHC 8.8.1
diff --git a/hw-streams.cabal b/hw-streams.cabal
index 694ca04..f49f637 100644
--- a/hw-streams.cabal
+++ b/hw-streams.cabal
@@ -26,7 +26,7 @@ flag bounds-checking-enabled
   manual: False
   default: False
 
-common base                 { build-depends: base                 >= 4.11       && < 5      }
+common base                 { build-depends: base                 >= 4.10       && < 5      }
 
 common bytestring           { build-depends: bytestring           >= 0.9        && < 0.11   }
 common criterion            { build-depends: criterion            >= 1.2        && < 1.6    }
diff --git a/src/HaskellWorks/Data/Streams/Stream.hs b/src/HaskellWorks/Data/Streams/Stream.hs
index 1bee063..752ce1b 100644
--- a/src/HaskellWorks/Data/Streams/Stream.hs
+++ b/src/HaskellWorks/Data/Streams/Stream.hs
@@ -6,6 +6,7 @@
 module HaskellWorks.Data.Streams.Stream where
 
 import Data.Bool
+import Data.Monoid                    ((<>))
 import HaskellWorks.Data.Streams.Size
 
 import Prelude hiding (drop, foldl, zipWith)