diff --git a/hnix.cabal b/hnix.cabal
--- a/hnix.cabal
+++ b/hnix.cabal
@@ -1,6 +1,6 @@
 cabal-version:  2.2
 name:           hnix
-version:        0.14.0.2
+version:        0.14.0.3
 synopsis:       Haskell implementation of the Nix language
 description:    Haskell implementation of the Nix language.
 category:       System, Data, Nix
diff --git a/src/Nix/Utils.hs b/src/Nix/Utils.hs
--- a/src/Nix/Utils.hs
+++ b/src/Nix/Utils.hs
@@ -14,6 +14,8 @@
 import qualified Data.Aeson.Encoding           as A
 #if MIN_VERSION_aeson(2,0,0)
 import qualified Data.Aeson.KeyMap             as AKM
+#else
+import qualified Data.HashMap                  as HM
 #endif
 import           Data.Fix                       ( Fix(..) )
 import qualified Data.HashMap.Lazy             as M