diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 1ea4f6d78f07..59612cb80160 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -990,6 +990,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
   regexPosix = self.regexPosix_0_72_0_3;
 
   regexTDFA = callPackage ../development/libraries/haskell/regex-tdfa {};
+  regexTdfa = self.regexTDFA;
 
   regexPCRE = callPackage ../development/libraries/haskell/regex-pcre {};
   regexPcre = self.regexPCRE;