diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index 6190dd9ab931..97a340b0acfe 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -47,6 +47,7 @@ self: super: {
   # Test suite does not compile.
   cereal = dontCheck super.cereal;
   data-clist = doJailbreak super.data-clist;  # won't cope with QuickCheck 2.12.x
+  dates = doJailbreak super.dates; # base >=4.9 && <4.12
   Diff = dontCheck super.Diff;
   hpc-coveralls = doJailbreak super.hpc-coveralls; # https://github.com/guillaume-nargeot/hpc-coveralls/issues/82
   http-api-data = doJailbreak super.http-api-data;