diff --git a/pkgs/development/compilers/gcc/all.nix b/pkgs/development/compilers/gcc/all.nix
index 70b4b75369a7..ba7d53b43583 100644
--- a/pkgs/development/compilers/gcc/all.nix
+++ b/pkgs/development/compilers/gcc/all.nix
@@ -5,7 +5,7 @@
 , callPackage
 , isl_0_11, isl_0_14, isl_0_17, isl_0_20
 , libcCross
-, threadsCrossFor
+, threadsCross
 , noSysDirs
 , texinfo5
 , cloog_0_18_0, cloog
@@ -25,7 +25,7 @@ let
         reproducibleBuild = true;
         profiledCompiler = false;
         libcCross = if stdenv.targetPlatform != stdenv.buildPlatform then args.libcCross else null;
-        threadsCross = if stdenv.targetPlatform != stdenv.buildPlatform then threadsCrossFor majorMinorVersion else { };
+        threadsCross = if stdenv.targetPlatform != stdenv.buildPlatform then threadsCross else { };
         isl = if       stdenv.isDarwin then null
               else if    atLeast "9"   then isl_0_20
               else if    atLeast "7"   then isl_0_17
diff --git a/pkgs/os-specific/windows/default.nix b/pkgs/os-specific/windows/default.nix
index 7d152a607b8e..234abcde1611 100644
--- a/pkgs/os-specific/windows/default.nix
+++ b/pkgs/os-specific/windows/default.nix
@@ -34,10 +34,6 @@ lib.makeScope newScope (self: with self; {
     stdenv = crossThreadsStdenv;
   };
 
-  mcfgthreads_pre_gcc_13 = callPackage ./mcfgthreads/pre_gcc_13.nix {
-    stdenv = crossThreadsStdenv;
-  };
-
   mcfgthreads = callPackage ./mcfgthreads {
     stdenv = crossThreadsStdenv;
   };
diff --git a/pkgs/os-specific/windows/mcfgthreads/pre_gcc_13.nix b/pkgs/os-specific/windows/mcfgthreads/pre_gcc_13.nix
deleted file mode 100644
index 6be64814c93a..000000000000
--- a/pkgs/os-specific/windows/mcfgthreads/pre_gcc_13.nix
+++ /dev/null
@@ -1,24 +0,0 @@
-{ stdenv, fetchFromGitHub, autoreconfHook }:
-
-stdenv.mkDerivation {
-  pname = "mcfgthreads";
-  version = "git"; # unstable-2021-03-12, not in any branch
-
-  src = fetchFromGitHub {
-    owner = "lhmouse";
-    repo = "mcfgthread";
-    rev = "c446cf4fcdc262fc899a188a4bb7136284c34222";
-    sha256 = "1ib90lrd4dz8irq4yvzwhxqa86i5vxl2q2z3z04sf1i8hw427p2f";
-  };
-
-  outputs = [ "out" "dev" ];
-
-  # Don't want prebuilt binaries sneaking in.
-  postUnpack = ''
-    rm -r "$sourceRoot/debug" "$sourceRoot/release"
-  '';
-
-  nativeBuildInputs = [
-    autoreconfHook
-  ];
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index eaa23105da40..d12b8b7aa73d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -17078,7 +17078,7 @@ with pkgs;
       # want the C++ library to be explicitly chosen by the caller, and null by
       # default.
       libcxx ? null
-    , extraPackages ? lib.optional (cc.isGNU or false && stdenv.targetPlatform.isMinGW) ((threadsCrossFor cc.version).package)
+    , extraPackages ? lib.optional (cc.isGNU or false && stdenv.targetPlatform.isMinGW) threadsCross.package
     , nixSupport ? {}
     , ...
     } @ extraArgs:
@@ -21151,16 +21151,12 @@ with pkgs;
 
   libcCross = assert stdenv.targetPlatform != stdenv.buildPlatform; libcCrossChooser stdenv.targetPlatform.libc;
 
-  threadsCross = threadsCrossFor null;
-  threadsCrossFor = cc_version:
+  threadsCross =
     lib.optionalAttrs (stdenv.targetPlatform.isMinGW && !(stdenv.targetPlatform.useLLVM or false)) {
       # other possible values: win32 or posix
       model = "mcf";
       # For win32 or posix set this to null
-      package =
-        if cc_version == null || lib.versionAtLeast cc_version "13"
-        then targetPackages.windows.mcfgthreads or windows.mcfgthreads
-        else targetPackages.windows.mcfgthreads_pre_gcc_13 or windows.mcfgthreads_pre_gcc_13;
+      package = targetPackages.windows.mcfgthreads or windows.mcfgthreads;
     };
 
   wasilibc = callPackage ../development/libraries/wasilibc {