1 files changed, 2 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/tools/parsing/tree-sitter/default.nix b/nixpkgs/pkgs/development/tools/parsing/tree-sitter/default.nix
index b9d7cfcd6afd..804f771cdca3 100644
--- a/nixpkgs/pkgs/development/tools/parsing/tree-sitter/default.nix
+++ b/nixpkgs/pkgs/development/tools/parsing/tree-sitter/default.nix
@@ -124,6 +124,8 @@ rustPlatform.buildRustPackage {
   # minifying the JavaScript; passing it allows us to side-step more Node
   # JS dependencies for installation.
   preBuild = lib.optionalString webUISupport ''
+    mkdir -p .emscriptencache
+    export EM_CACHE=$(pwd)/.emscriptencache
     bash ./script/build-wasm --debug
   '';