diff --git a/src/environment.rs b/src/environment.rs
index cfe123a..6955767 100644
--- a/src/environment.rs
+++ b/src/environment.rs
@@ -7,7 +7,7 @@ use std::ffi::{OsStr, OsString};
 use std::path::PathBuf;
 use std::{env, io};
 
-pub trait Environment: ShellInterface {
+pub trait Environment {
   fn args_os(&self) -> Vec<OsString>;
   fn var<K>(&self, key: K) -> Result<String, VarError>
   where
diff --git a/src/main.rs b/src/main.rs
index 8e3cc84..53dc2d5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,7 +16,7 @@ use crate::logger::{LogLevel, Logger};
 use crate::os_str_extension::OsStrExtension;
 use crate::os_string_builder::ReplaceWithOsStr;
 use crate::server::{RelativeLocalPathAnker, ServerAddress};
-use crate::shell_interface::{ScpParam, ServerCommand, ShellCommand};
+use crate::shell_interface::{ScpParam, ServerCommand, ShellCommand, ShellInterface};
 use clap::{Parser, Subcommand, ValueEnum};
 use lazy_regex::{lazy_regex, Lazy, Regex};
 use server::{Server, ServerReference};
@@ -145,7 +145,7 @@ pub struct Application<E> {
 
 impl<E> Application<E>
 where
-  E: Environment,
+  E: Environment + ShellInterface,
 {
   pub fn run(&mut self) -> Result<(), String> {
     let args = Args::try_parse_from(self.environment.args_os()).map_err(|e| e.to_string())?;