diff --git a/default.nix b/default.nix
index abdc904..ebeea18 100644
--- a/default.nix
+++ b/default.nix
@@ -58,8 +58,7 @@ in haskellPackages.developPackage {
 
   modifier = drv: pkgs.haskell.lib.overrideCabal drv (attrs: {
     testHaskellDepends = attrs.testHaskellDepends ++
-      [ pkgs.nix
-        haskellPackages.hpack ];
+      [ pkgs.nix haskellPackages_8_2.hpack ];
 
     enableLibraryProfiling    = doProfiling;
     enableExecutableProfiling = doProfiling;