diff --git a/library/core/src/sync/atomic.rs b/library/core/src/sync/atomic.rs
index 0601019abbd5c..1eae06ebd33e7 100644
--- a/library/core/src/sync/atomic.rs
+++ b/library/core/src/sync/atomic.rs
@@ -1151,8 +1151,8 @@ impl AtomicBool {
     /// assert_eq!(foo.fetch_or(false, Ordering::SeqCst), true);
     /// assert_eq!(foo.load(Ordering::SeqCst), true);
     ///
-    /// let foo = AtomicBool::new(true);
-    /// assert_eq!(foo.fetch_or(true, Ordering::SeqCst), true);
+    /// let foo = AtomicBool::new(false);
+    /// assert_eq!(foo.fetch_or(true, Ordering::SeqCst), false);
     /// assert_eq!(foo.load(Ordering::SeqCst), true);
     ///
     /// let foo = AtomicBool::new(false);