diff --git a/changelog/2718.added.md b/changelog/2718.added.md
new file mode 100644
index 0000000000..8c80e804e7
--- /dev/null
+++ b/changelog/2718.added.md
@@ -0,0 +1 @@
+Add WatchDescriptor::inner_id, to get libc id of WatchDescriptor.
diff --git a/src/sys/inotify.rs b/src/sys/inotify.rs
index 3a00ea0d1d..4e8769eead 100644
--- a/src/sys/inotify.rs
+++ b/src/sys/inotify.rs
@@ -113,6 +113,12 @@ pub struct Inotify {
 pub struct WatchDescriptor {
     wd: i32,
 }
+impl WatchDescriptor {
+    /// Inner WatchDescriptor, from libc.
+    pub fn inner_id(self) -> i32 {
+        self.wd
+    }
+}
 
 /// A single inotify event.
 ///
@@ -270,4 +276,4 @@ impl From<Inotify> for OwnedFd {
     fn from(value: Inotify) -> Self {
         value.fd
     }
-}
\ No newline at end of file
+}