diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 9aa3ad849c7..3243f2b1b06 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -5,7 +5,7 @@ with import ./lib.nix { inherit pkgs; };
 self: super: {
 
   # Some packages need a non-core version of Cabal.
-  Cabal_1_18_1_6 = doJailbreak (dontCheck super.Cabal_1_18_1_6);
+  Cabal_1_18_1_6 = dontCheck super.Cabal_1_18_1_6;
   Cabal_1_20_0_3 = doJailbreak (dontCheck super.Cabal_1_20_0_3);
   Cabal_1_22_0_0 = dontCheck super.Cabal_1_22_0_0;
   cabal-install = dontCheck (super.cabal-install.override { Cabal = self.Cabal_1_22_0_0; });