diff --git a/pkgs/by-name/tr/tree-sitter/package.nix b/pkgs/by-name/tr/tree-sitter/package.nix
index cc4522b35f21..c52f390e7e49 100644
--- a/pkgs/by-name/tr/tree-sitter/package.nix
+++ b/pkgs/by-name/tr/tree-sitter/package.nix
@@ -167,7 +167,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   postPatch =
     lib.optionalString webUISupport ''
-      substituteInPlace cli/loader/src/lib.rs \
+      substituteInPlace crates/xtask/src/build_wasm.rs \
           --replace-fail 'let emcc_name = if cfg!(windows) { "emcc.bat" } else { "emcc" };' 'let emcc_name = "${lib.getExe' emscripten "emcc"}";'
     ''
     # when building on static platforms: