diff --git a/src/sys/shell/selector.rs b/src/sys/shell/selector.rs
index 83456ef87..c31a7d360 100644
--- a/src/sys/shell/selector.rs
+++ b/src/sys/shell/selector.rs
@@ -21,7 +21,7 @@ impl Selector {
 }
 
 #[cfg(unix)]
-cfg_any_os_ext! {
+cfg_os_ext! {
     use crate::{Interest, Token};
 
     impl Selector {
diff --git a/src/sys/unix/mod.rs b/src/sys/unix/mod.rs
index 6c0c8850e..93bc78924 100644
--- a/src/sys/unix/mod.rs
+++ b/src/sys/unix/mod.rs
@@ -106,6 +106,7 @@ cfg_os_poll! {
     // NOTE: the `Waker` type is expected in the selector module as the
     // `poll(2)` implementation needs to do some special stuff.
 
+    #[allow(unused)]
     mod sourcefd;
     #[cfg(feature = "os-ext")]
     pub use self::sourcefd::SourceFd;
@@ -156,9 +157,8 @@ cfg_os_poll! {
 }
 
 cfg_not_os_poll! {
-    cfg_any_os_ext! {
+    cfg_os_ext! {
         mod sourcefd;
-        #[cfg(feature = "os-ext")]
         pub use self::sourcefd::SourceFd;
     }
 }