diff --git a/tests/stress/dune b/tests/stress/dune
index f91efe0..4897320 100644
--- a/tests/stress/dune
+++ b/tests/stress/dune
@@ -8,4 +8,8 @@
  (deps
   %{bin:ff}
   %{bin:ff_wrapper}
-  (glob_files *.fun)))
+  (glob_files *.fun)
+  %{lib-private:runtime:libfun_rt.a}
+  %{lib-private:runtime:fun_rt.hpp}
+  %{lib-private:runtime:fun_rt_core.hpp}
+  %{lib-private:runtime:fun_rt_lib.hpp}))
diff --git a/tests/stress/test_entry.ml b/tests/stress/test_entry.ml
index 3649a65..48d9a03 100644
--- a/tests/stress/test_entry.ml
+++ b/tests/stress/test_entry.ml
@@ -3,7 +3,11 @@ module U = Util
 let sum_test =
   let rec sum x = if x = 0 then 0 else x + sum (x - 1) in
   QCheck.Test.make ~count:10 ~name:"sum.exe property" QCheck.small_nat
-    (fun i -> U.call_ff_int_to_int ~case:"sum.fun" i = sum i)
+    (fun i ->
+      Alcotest.(check int)
+        "int compare" (sum i)
+        (U.call_ff_int_to_int ~case:"sum.fun" i);
+      true)
 
 let fib_test =
   let rec fib x =
@@ -13,7 +17,11 @@ let fib_test =
     | _ -> fib (x - 1) + fib (x - 2)
   in
   QCheck.Test.make ~count:5 ~name:"fib.exe propety" (QCheck.int_bound 30)
-    (fun i -> U.call_ff_int_to_int ~case:"fib.fun" i = fib i)
+    (fun i ->
+      Alcotest.(check int)
+        "int compare" (fib i)
+        (U.call_ff_int_to_int ~case:"fib.fun" i);
+      true)
 
 module RTA = Rand_struct_access
 
@@ -23,8 +31,12 @@ let struct_acces_test =
       (QCheck.make RTA.tree_gen ~print:(fun tree ->
            fst (RTA.test_case_of_tree tree)))
       (fun tree ->
+        let _int_list_tsetable = Alcotest.(list int) in
         let prog, expect = RTA.test_case_of_tree tree in
-        U.call_ff_on_prog_to_int_list ~prog = expect))
+        Alcotest.(check (list int))
+          "int list should equal" expect
+          (U.call_ff_on_prog_to_int_list ~prog);
+        true))
 
 let () =
   let suite =
diff --git a/tests/stress/util.ml b/tests/stress/util.ml
index 6255899..6d198fb 100644
--- a/tests/stress/util.ml
+++ b/tests/stress/util.ml
@@ -32,18 +32,15 @@ let call_ff_on_prog_to_int_list ~(prog : string) : int list =
   let oc = open_out temp_file in
   Printf.fprintf oc "%s" prog;
   close_out oc;
-  (* compiling *)
-  Printf.printf "Call ff_wraper on tempfile %s\n" temp_file;
-  let _pid =
-    Unix.create_process "ff_wrapper"
-      [| "ff_wrapper"; temp_file |]
-      Unix.stdin Unix.stdout Unix.stderr
-  in
-  ignore (Unix.wait ());
-  let exe = Printf.sprintf "%s.out" temp_file in
-  Printf.printf "Dumped exe file path: %s\n" exe;
   Lwt_main.run
-    (let* out = Lwt_process.pread (exe, [| exe |]) in
+    ((* compiling *)
+     Printf.printf "Call ff_wraper on tempfile %s\n" temp_file;
+     let* ret =
+       Lwt_process.exec ("ff_wrapper", [| "ff_wrapper"; temp_file |])
+     in
+     let exe = Printf.sprintf "%s.out" temp_file in
+     Printf.printf "Dumped exe file path: %s\n" exe;
+     let* out = Lwt_process.pread (exe, [| exe |]) in
      let lines = String.split_on_char '\n' out in
      let ints =
        List.(lines |> filter (fun s -> s <> "") |> map int_of_string)