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-rw-r--r--nixos/modules/services/misc/ihaskell.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixos/modules/services/misc/ihaskell.nix b/nixos/modules/services/misc/ihaskell.nix
index 13c41466eab..1927922909e 100644
--- a/nixos/modules/services/misc/ihaskell.nix
+++ b/nixos/modules/services/misc/ihaskell.nix
@@ -22,6 +22,7 @@ in
       };
 
       haskellPackages = mkOption {
+        type = types.attrsOf types.package;
         default = pkgs.haskellPackages;
         defaultText = "pkgs.haskellPackages";
         example = literalExample "pkgs.haskell.packages.ghc784";