diff --git a/shell.nix b/shell.nix
index c091f175..858e68b9 100644
--- a/shell.nix
+++ b/shell.nix
@@ -6,5 +6,4 @@ in
     buildInputs = with pkgs; [
       llvm_10 clang_10 cargo rustc libffi libxml2 clippy
     ];
-    LLVM_SYS_100_PREFIX="${pkgs.llvm_10}";
   }