diff --git a/pkgs/development/tools/lambdabot/default.nix b/pkgs/development/tools/haskell/lambdabot/default.nix
similarity index 100%
rename from pkgs/development/tools/lambdabot/default.nix
rename to pkgs/development/tools/haskell/lambdabot/default.nix
diff --git a/pkgs/development/tools/mueval/default.nix b/pkgs/development/tools/haskell/mueval/default.nix
similarity index 99%
rename from pkgs/development/tools/mueval/default.nix
rename to pkgs/development/tools/haskell/mueval/default.nix
index d7cc572bdb4..aa445238f22 100644
--- a/pkgs/development/tools/mueval/default.nix
+++ b/pkgs/development/tools/haskell/mueval/default.nix
@@ -19,7 +19,7 @@ in stdenv.mkDerivation {
 
   buildCommand = ''
     mkdir -p $out/bin
-    
+
     makeWrapper $mueval/bin/mueval $out/bin/mueval \
       --prefix PATH ":" "$out/bin"
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 919e74e3706..73a175a0a57 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7078,7 +7078,7 @@ let
     texinfo = texinfo4;
   };
 
-  mueval = callPackage ../development/tools/mueval { };
+  mueval = callPackage ../development/tools/haskell/mueval { };
 
   muparser = callPackage ../development/libraries/muparser { };
 
@@ -7415,7 +7415,7 @@ let
 
   readosm = callPackage ../development/libraries/readosm { };
 
-  lambdabot = callPackage ../development/tools/lambdabot { };
+  lambdabot = callPackage ../development/tools/haskell/lambdabot { };
 
   leksah = callPackage ../development/tools/leksah {
     inherit (haskellngPackages) ghcWithPackages;