diff --git a/serde/build.rs b/serde/build.rs
index 7a5ce83a..da960fd8 100644
--- a/serde/build.rs
+++ b/serde/build.rs
@@ -16,12 +16,6 @@ fn main() {
     let target = env::var("TARGET").unwrap();
     let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
 
-    // PathBuf::into_boxed_path stabilized in Rust 1.20:
-    // https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.into_boxed_path
-    if minor < 20 {
-        println!("cargo:rustc-cfg=no_de_boxed_path");
-    }
-
     // From<Box<T>> for Rc<T> / Arc<T> stabilized in Rust 1.21:
     // https://doc.rust-lang.org/std/rc/struct.Rc.html#impl-From<Box<T>>
     // https://doc.rust-lang.org/std/sync/struct.Arc.html#impl-From<Box<T>>
diff --git a/serde/src/de/impls.rs b/serde/src/de/impls.rs
index b362a216..959295d1 100644
--- a/serde/src/de/impls.rs
+++ b/serde/src/de/impls.rs
@@ -1710,7 +1710,7 @@ impl<'de> Deserialize<'de> for PathBuf {
     }
 }
 
-#[cfg(all(feature = "std", not(no_de_boxed_path)))]
+#[cfg(feature = "std")]
 forwarded_impl!((), Box<Path>, PathBuf::into_boxed_path);
 
 ////////////////////////////////////////////////////////////////////////////////