diff --git a/hledger-lib/Hledger/Read/JournalReader.hs b/hledger-lib/Hledger/Read/JournalReader.hs
index 760acd58d..a936e582d 100644
--- a/hledger-lib/Hledger/Read/JournalReader.hs
+++ b/hledger-lib/Hledger/Read/JournalReader.hs
@@ -73,6 +73,9 @@ import Control.Monad.Except (ExceptT(..), runExceptT)
 import Control.Monad.State.Strict (get,modify',put)
 import Control.Monad.Trans.Class (lift)
 import qualified Data.Map.Strict as M
+#if !(MIN_VERSION_base(4,11,0))
+import Data.Monoid ((<>))
+#endif
 import Data.Text (Text)
 import Data.String
 import Data.List
diff --git a/hledger-lib/Hledger/Utils/Test.hs b/hledger-lib/Hledger/Utils/Test.hs
index 361957fac..b1de72bfe 100644
--- a/hledger-lib/Hledger/Utils/Test.hs
+++ b/hledger-lib/Hledger/Utils/Test.hs
@@ -25,9 +25,9 @@ where
 
 import Control.Monad.Except (ExceptT, runExceptT)
 import Control.Monad.State.Strict (StateT, evalStateT, execStateT)
--- #if !(MIN_VERSION_base(4,11,0))
--- import Data.Monoid ((<>))
--- #endif
+#if !(MIN_VERSION_base(4,11,0))
+import Data.Monoid ((<>))
+#endif
 -- import Data.CallStack
 import Data.List (isInfixOf)
 import qualified Data.Text as T