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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 684a242d738..c7332b87803 100644
--- a/nixos/modules/services/misc/ihaskell.nix
+++ b/nixos/modules/services/misc/ihaskell.nix
@@ -21,6 +21,7 @@ in
       };
 
       extraPackages = mkOption {
+        type = types.functionTo (types.listOf types.package);
         default = self: [];
         example = literalExample ''
           haskellPackages: [