diff --git a/flake.nix b/flake.nix
index 9989c4c..e041736 100644
--- a/flake.nix
+++ b/flake.nix
@@ -145,8 +145,6 @@
               ]
               ++ deps;
 
-            INCLUDE_DIR = "${llvmPackages_18.libcxx.dev}/include/c++/v1";
-
             name = "C++";
           };
         }