diff --git a/src/Cron.fs b/src/Cron.fs
index 8be832b..d2e1a2b 100644
--- a/src/Cron.fs
+++ b/src/Cron.fs
@@ -84,7 +84,7 @@ let private parse now (db: Requirements) =
             else
                 Ok (splitted.[0], splitted.[1]))
 
-    let executable = Which.which db.executable
+    let executable = Shell.which db.executable
     let workdir = Path.of_string db.workdir |> Result.bind FileSystem.resolve
 
     Result.zip when_ env
diff --git a/src/Which.fs b/src/Which.fs
deleted file mode 100644
index 3975db5..0000000
--- a/src/Which.fs
+++ /dev/null
@@ -1,40 +0,0 @@
-module Bidello.Which
-
-open Sheller
-open Pentole.Path
-
-let which (executable: string) =
-    let possible_shells = [
-        "/bin/sh"
-        "/bin/bash"
-        "/bin/dash"
-        "/bin/fish"
-        "/usr/bin/sh"
-        "/usr/bin/bash"
-        "/usr/bin/dash"
-        "/usr/bin/fish"
-    ]
-
-    let shell = List.tryFind (fun sh -> sh |> Path.of_string |> Result.isOk) possible_shells
-
-    if shell |> Option.isSome then
-        let rc = 
-            Builder
-                .UseShell(shell.Value)
-                .UseExecutable("which")
-                .WithArgument(executable)
-                .UseNoThrow()
-                .ExecuteAsync ()
-                |> Async.AwaitTask
-                |> Async.RunSynchronously
-        if rc.ExitCode = 0 then
-            rc.StandardOutput
-            |> _.Trim()
-            |> Path.of_string
-        elif rc.ExitCode = 1 then
-            Error $"Can't find executable path for \"{executable}\"."
-        else
-            rc.StandardError
-            |> Error
-    else
-        Error "Can't find the system shell. Check your system $PATH."