diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index bc3284bcf2b..1713cfdb44c 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -920,7 +920,4 @@ self: super: {
     librarySystemDepends = (drv.librarySystemDepends or []) ++ [ pkgs.ncurses ];
   });
 
-  # Re-build this package to fix broken binaries on Hydra.
-  math-functions = triggerRebuild super.math-functions 1;
-
 }
diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
index c685f310393..f9f94c8f57d 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
@@ -212,4 +212,7 @@ self: super: {
   # https://github.com/DanielG/cabal-helper/issues/10
   cabal-helper = dontCheck super.cabal-helper;
 
+  # Re-build this package to fix broken binaries on Hydra.
+  math-functions = triggerRebuild super.math-functions 2;
+
 }