diff --git a/nix-js/src/runtime.rs b/nix-js/src/runtime.rs
index 53c605d..eae924f 100644
--- a/nix-js/src/runtime.rs
+++ b/nix-js/src/runtime.rs
@@ -715,6 +715,8 @@ impl<Ctx: RuntimeContext> Runtime<Ctx> {
         // Initialize V8 once
         static INIT: Once = Once::new();
         INIT.call_once(|| {
+            // First flag is always not recognized
+            assert_eq!(deno_core::v8_set_flags(vec!["".into(), format!("--stack-size={}", 8 * 1024)]), [""]);
             JsRuntime::init_platform(
                 Some(v8::new_default_platform(0, false).make_shared()),
                 false,
diff --git a/nix-js/tests/regex.rs b/nix-js/tests/regex.rs
index 0de6cd0..33d1b8b 100644
--- a/nix-js/tests/regex.rs
+++ b/nix-js/tests/regex.rs
@@ -3,6 +3,8 @@ mod utils;
 use nix_js::value::{List, Value};
 use utils::eval;
 
+use crate::utils::eval_result;
+
 #[test]
 fn match_exact_full_string() {
     assert_eq!(
@@ -253,8 +255,7 @@ fn replace_longer_pattern() {
 
 #[test]
 fn replace_different_lengths() {
-    let result =
-        std::panic::catch_unwind(|| eval(r#"builtins.replaceStrings ["a" "b"] ["x"] "test""#));
+    let result = eval_result(r#"builtins.replaceStrings ["a" "b"] ["x"] "test""#);
     assert!(result.is_err());
 }