diff --git a/zork++/benches/benchmarks.rs b/zork++/benches/benchmarks.rs
index 9198c435..54305ec5 100644
--- a/zork++/benches/benchmarks.rs
+++ b/zork++/benches/benchmarks.rs
@@ -17,10 +17,10 @@ pub fn build_project_benchmark(c: &mut Criterion) {
         config_file::zork_cfg_from_file(utils::constants::CONFIG_FILE_MOCK).unwrap();
     let cli_args = CliArgs::parse();
     let program_data = build_model(&config, &cli_args, Path::new(".")).unwrap();
-    let cache = ZorkCache::default();
+    let mut cache = ZorkCache::default();
 
     c.bench_function("Build project", |b| {
-        b.iter(|| build_project(black_box(&program_data), black_box(&cache), false))
+        b.iter(|| build_project(black_box(&program_data), black_box(&mut cache), false))
     });
 
     c.bench_function("Cache loading time", |b| {