diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
index c7ef534d7855..675a9619d313 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
@@ -137,6 +137,7 @@ self: super: {
 
   # Needs void on pre 7.10.x compilers.
   conduit = addBuildDepend super.conduit self.void;
+  conduit_1_2_5 = addBuildDepend super.conduit_1_2_5 self.void;
 
   # Needs nats on pre 7.10.x compilers.
   semigroups = addBuildDepend super.semigroups self.nats;