diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 1cf0c2b6f0e..d6c8228792b 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -15570,7 +15570,7 @@ self: {
        sha256 = "139lggc8f7sw703asdyxqbja0jfcgphx0l5si1046lsryinvywa9";
        libraryHaskellDepends = [ base containers text time ];
        testHaskellDepends = [
-         base containers hspec QuickCheck scalendar text time
+         base containers hspec QuickCheck text time
        ];
        homepage = "https://www.researchgate.net/publication/311582722_Method_of_Managing_Resources_in_a_Telecommunication_Network_or_a_Computing_System";
        description = "This is a library for handling calendars and resource availability based on the \"top-nodes algorithm\" and set operations";