diff --git a/overlay.nix b/overlay.nix
index 0683b8b8..80f694a2 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -31,7 +31,7 @@ let
     });
     lmbench = callPackage ./pkgs/lmbench/default.nix { };
     # Broken and unmantained
-    # mcxx = callPackage ./pkgs/mcxx/default.nix { };
+    mcxx = callPackage ./pkgs/mcxx/default.nix { };
     meteocat-exporter = prev.callPackage ./pkgs/meteocat-exporter/default.nix { };
     mpi = final.mpich; # Set MPICH as default
     mpich = callPackage ./pkgs/mpich/default.nix { mpich = prev.mpich; };
diff --git a/pkgs/mcxx/default.nix b/pkgs/mcxx/default.nix
index 41fe2f5b..743a25ca 100644
--- a/pkgs/mcxx/default.nix
+++ b/pkgs/mcxx/default.nix
@@ -11,7 +11,7 @@
 , sqlite
 , flex
 , bison
-, gcc
+, gcc13
 }:
 
 stdenv.mkDerivation rec {
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
     gfortran
     pkg-config
     gperf
-    gcc
+    gcc13
   ];
 
   buildInputs = [