diff --git a/pkgs/development/libraries/haskell/bytestring-lexing/default.nix b/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
index 93c8b2aa2290..8c4f2af654e1 100644
--- a/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
+++ b/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "bytestring-lexing";
-  version = "0.4.3";
-  sha256 = "0dynfrf8ym01v2dl57422h8r75kdlqh2qzqi9yc0f1bmbfqxap6r";
+  version = "0.4.3.1";
+  sha256 = "1n0sk1xqwkj4whp0gav7hwr33xqmwl3ylqfnqix8wbwz6xpg9ygn";
   buildTools = [ alex ];
   meta = {
     homepage = "http://code.haskell.org/~wren/";