diff --git a/xtask/src/codegen/gen_unstable_future_descriptor.rs b/xtask/src/codegen/gen_unstable_future_descriptor.rs
index fee68c3658..56065f17da 100644
--- a/xtask/src/codegen/gen_unstable_future_descriptor.rs
+++ b/xtask/src/codegen/gen_unstable_future_descriptor.rs
@@ -30,7 +30,7 @@ pub fn generate_unstable_future_descriptor(mode: Mode) -> Result<()> {
         .filter(|entry| {
             // Get all `.md ` files
             entry.file_type().is_file()
-                && entry.path().extension().map(|ext| ext == "md").unwrap_or(false)
+                && entry.path().extension().unwrap_or_default() == "md"
         })
         .collect::<Vec<_>>();