diff --git a/pkgs/development/libraries/haskell/fgl/5.4.2.2.nix b/pkgs/development/libraries/haskell/fgl/5.4.2.2.nix
deleted file mode 100644
index 61043f82f97..00000000000
--- a/pkgs/development/libraries/haskell/fgl/5.4.2.2.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, mtl }:
-
-cabal.mkDerivation (self: {
-  pname = "fgl";
-  version = "5.4.2.2";
-  sha256 = "8232c337f0792854bf2a12a5fd1bc46726fff05d2f599053286ff873364cd7d2";
-  buildDepends = [ mtl ];
-  meta = {
-    homepage = "http://web.engr.oregonstate.edu/~erwig/fgl/haskell";
-    description = "Martin Erwig's Functional Graph Library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/fgl/5.4.2.3.nix b/pkgs/development/libraries/haskell/fgl/5.4.2.3.nix
deleted file mode 100644
index 1ecc9fb05e7..00000000000
--- a/pkgs/development/libraries/haskell/fgl/5.4.2.3.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, mtl }:
-
-cabal.mkDerivation (self: {
-  pname = "fgl";
-  version = "5.4.2.3";
-  sha256 = "1f46siqqv8bc9v8nxr72nxabpzfax117ncgdvif6rax5ansl48g7";
-  buildDepends = [ mtl ];
-  meta = {
-    homepage = "http://web.engr.oregonstate.edu/~erwig/fgl/haskell";
-    description = "Martin Erwig's Functional Graph Library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/fgl/5.4.2.4.nix b/pkgs/development/libraries/haskell/fgl/5.4.2.4.nix
deleted file mode 100644
index 65596c350de..00000000000
--- a/pkgs/development/libraries/haskell/fgl/5.4.2.4.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, mtl }:
-
-cabal.mkDerivation (self: {
-  pname = "fgl";
-  version = "5.4.2.4";
-  sha256 = "0rh22786f37mpsvhkv075wjh5sd0c83nlhk669xil9rd7swcr66f";
-  buildDepends = [ mtl ];
-  meta = {
-    homepage = "http://web.engr.oregonstate.edu/~erwig/fgl/haskell";
-    description = "Martin Erwig's Functional Graph Library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/fgl/5.5.0.0.nix b/pkgs/development/libraries/haskell/fgl/5.5.0.0.nix
deleted file mode 100644
index 4fd2a4d0597..00000000000
--- a/pkgs/development/libraries/haskell/fgl/5.5.0.0.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-# This file was auto-generated by cabal2nix. Please do NOT edit manually!
-
-{ cabal, mtl }:
-
-cabal.mkDerivation (self: {
-  pname = "fgl";
-  version = "5.5.0.0";
-  sha256 = "1kdqxbpsaka97rx0c7czlc1nfi72mdxs46gnqa8p0wxn1vx437g3";
-  buildDepends = [ mtl ];
-  meta = {
-    homepage = "http://web.engr.oregonstate.edu/~erwig/fgl/haskell";
-    description = "Martin Erwig's Functional Graph Library";
-    license = self.stdenv.lib.licenses.bsd3;
-    platforms = self.ghc.meta.platforms;
-    hydraPlatforms = self.stdenv.lib.platforms.none;
-  };
-})
diff --git a/pkgs/development/libraries/haskell/fgl/5.5.0.1.nix b/pkgs/development/libraries/haskell/fgl/default.nix
similarity index 100%
rename from pkgs/development/libraries/haskell/fgl/5.5.0.1.nix
rename to pkgs/development/libraries/haskell/fgl/default.nix
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 2c522c4252a..748d7e2710b 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -848,11 +848,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   final = callPackage ../development/libraries/haskell/final {};
 
-  fgl_5_4_2_2 = callPackage ../development/libraries/haskell/fgl/5.4.2.2.nix {};
-  fgl_5_4_2_3 = callPackage ../development/libraries/haskell/fgl/5.4.2.3.nix {};
-  fgl_5_4_2_4 = callPackage ../development/libraries/haskell/fgl/5.4.2.4.nix {};
-  fgl_5_5_0_1 = callPackage ../development/libraries/haskell/fgl/5.5.0.1.nix {};
-  fgl = self.fgl_5_5_0_1;
+  fgl = callPackage ../development/libraries/haskell/fgl {};
 
   fglVisualize = callPackage ../development/libraries/haskell/fgl-visualize {};