diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 45bf00ca46d..8ee50c5ae93 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -140,7 +140,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
     regexPosix   = self.regexPosix_0_95_2;      # 7.6 ok
     split        = self.split_0_2_1_2;          # 7.6 ok
     stm          = self.stm_2_4_2;              # 7.6 ok
-    syb          = self.syb_0_3_7;              # 7.6 ok
+    syb          = self.syb_0_4_0;              # 7.6 ok
     text         = self.text_0_11_2_3;          # 7.6 ok
     transformers = self.transformers_0_3_0_0;   # 7.6 ok
     vector       = self.vector_0_10_0_1;        # 7.6 ok
@@ -1621,6 +1621,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
   syb_0_3_6_1 = callPackage ../development/libraries/haskell/syb/0.3.6.1.nix {};
   syb_0_3_6_2 = callPackage ../development/libraries/haskell/syb/0.3.6.2.nix {};
   syb_0_3_7 = callPackage ../development/libraries/haskell/syb/0.3.7.nix {};
+  syb_0_4_0 = callPackage ../development/libraries/haskell/syb/0.4.0.nix {};
   syb = null;  # by default, we assume that syb ships with GHC, which is
                # true for the older GHC versions