diff --git a/src/os_string_builder.rs b/src/os_string_builder.rs
index a00f3a1..182b2df 100644
--- a/src/os_string_builder.rs
+++ b/src/os_string_builder.rs
@@ -2,7 +2,6 @@ use std::ffi::{OsStr, OsString};
 use std::fmt::{Debug, Formatter};
 use std::hash::{Hash, Hasher};
 use std::ops::{Add, AddAssign};
-use std::os::unix::ffi::OsStrExt;
 
 #[derive(Clone, Default, Eq)]
 pub struct OsStringBuilder {
@@ -75,22 +74,6 @@ impl Hash for OsStringBuilder {
   }
 }
 
-pub fn ensure_trailing_slash(path: impl AsRef<OsStr>) -> OsString {
-  let mut str = path.as_ref().to_os_string();
-  if !str.as_bytes().ends_with(b"/") {
-    str.push("/")
-  }
-  str
-}
-
-#[macro_export]
-macro_rules! dir {
-  ($path:expr) => {{
-    use $crate::os_string_builder::ensure_trailing_slash;
-    ensure_trailing_slash($path)
-  }};
-}
-
 #[macro_export]
 macro_rules! osf {
   () => {{
@@ -116,6 +99,6 @@ mod test {
     let foo = PathBuf::from("foo");
     let bar = PathBuf::from("bar");
 
-    assert_eq!(osf!("cd ") + dir!(foo) + dir!(bar), "cd foo/bar/");
+    assert_eq!(osf!("cd ") + foo.join(&bar), "cd foo/bar");
   }
 }