diff --git a/pkgs/development/tools/parsing/happy/1.18.11.nix b/pkgs/development/tools/parsing/happy/1.18.11.nix
deleted file mode 100644
index e7abe930013..00000000000
--- a/pkgs/development/tools/parsing/happy/1.18.11.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, mtl, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "happy";
-  version = "1.18.11";
-  sha256 = "1hssiihzl7xipmn5bz71q30wbq2sj92lh2f7z4jarckhldwcqfi9";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ mtl ];
-  buildTools = [ perl ];
-  meta = {
-    homepage = "http://www.haskell.org/happy/";
-    description = "Happy is a parser generator for Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/happy/1.18.8.nix b/pkgs/development/tools/parsing/happy/1.18.8.nix
deleted file mode 100644
index 141205d1940..00000000000
--- a/pkgs/development/tools/parsing/happy/1.18.8.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-{ cabal, mtl, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "happy";
-  version = "1.18.8";
-  sha256 = "1mqdawxszmdk71fbl8ljxz7jyhai00sflaw0gahp039n44mrspam";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ mtl ];
-  buildTools = [ perl ];
-  patches = [ ./adapt-crazy-perl-regex-for-cpp-4.8.0.patch ];
-  meta = {
-    homepage = "http://www.haskell.org/happy/";
-    description = "Happy is a parser generator for Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/happy/1.19.2.nix b/pkgs/development/tools/parsing/happy/1.19.2.nix
deleted file mode 100644
index 4173d6d6c11..00000000000
--- a/pkgs/development/tools/parsing/happy/1.19.2.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-{ cabal, mtl, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "happy";
-  version = "1.19.2";
-  sha256 = "1m74dz83fs7gbcr040nhfx1xw3smjk24g5cp6a0wxvrmlh12yc66";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ mtl ];
-  buildTools = [ perl ];
-  patchPhase = "sed -i -e '/^import Data.Monoid/d' Setup.lhs";
-  meta = {
-    homepage = "http://www.haskell.org/happy/";
-    description = "Happy is a parser generator for Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/development/tools/parsing/happy/1.19.3.nix b/pkgs/development/tools/parsing/happy/1.19.3.nix
deleted file mode 100644
index c43806cd2df..00000000000
--- a/pkgs/development/tools/parsing/happy/1.19.3.nix
+++ /dev/null
@@ -1,22 +0,0 @@
-{ cabal, mtl, perl }:
-
-cabal.mkDerivation (self: {
-  pname = "happy";
-  version = "1.19.3";
-  sha256 = "1q3hipgcwvrf333wlyqmg4mgf24gwiagddlfyr9zgi4k42p2373x";
-  isLibrary = false;
-  isExecutable = true;
-  buildDepends = [ mtl ];
-  buildTools = [ perl ];
-  preConfigure = self.stdenv.lib.optional (self.stdenv.lib.versionOlder "7.9" self.ghc.version) ''
-    sed -i -e 's|extensions: |extensions: FlexibleContexts, |' happy.cabal
-    sed -i -e 's|> import System.Exit|> import System.Exit ( exitWith, ExitCode(..) )|' src/Main.lhs
-  '';
-  meta = {
-    homepage = "http://www.haskell.org/happy/";
-    description = "Happy is a parser generator for Haskell";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    maintainers = [ self.stdenv.lib.maintainers.andres ];
-  };
-})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 6a18ca30e55..1c8a80a1afc 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -2743,12 +2743,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   happy_1_18_4 = callPackage ../development/tools/parsing/happy/1.18.4.nix {};
   happy_1_18_5 = callPackage ../development/tools/parsing/happy/1.18.5.nix {};
   happy_1_18_6 = callPackage ../development/tools/parsing/happy/1.18.6.nix {};
-  happy_1_18_8 = callPackage ../development/tools/parsing/happy/1.18.8.nix {};
   happy_1_18_9 = callPackage ../development/tools/parsing/happy/1.18.9.nix {};
   happy_1_18_10 = callPackage ../development/tools/parsing/happy/1.18.10.nix {};
-  happy_1_18_11 = callPackage ../development/tools/parsing/happy/1.18.11.nix {};
-  happy_1_19_2 = callPackage ../development/tools/parsing/happy/1.19.2.nix {};
-  happy_1_19_3 = callPackage ../development/tools/parsing/happy/1.19.3.nix {};
   happy_1_19_4 = callPackage ../development/tools/parsing/happy/1.19.4.nix {};
   happy = self.happy_1_19_4;