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-rw-r--r--nixpkgs/nixos/modules/services/development/hoogle.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/development/hoogle.nix b/nixpkgs/nixos/modules/services/development/hoogle.nix
index a661e3acae3e..6d6c88b9b2aa 100644
--- a/nixpkgs/nixos/modules/services/development/hoogle.nix
+++ b/nixpkgs/nixos/modules/services/development/hoogle.nix
@@ -25,6 +25,7 @@ in {
     };
 
     packages = mkOption {
+      type = types.functionTo (types.listOf types.package);
       default = hp: [];
       defaultText = "hp: []";
       example = "hp: with hp; [ text lens ]";