diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
index 54a7dc691cc0c8..3f60a1cd7ff7c7 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
@@ -392,13 +392,24 @@ public bool TryReset()
             // to transition from canceled to non-canceled.
             if (_state == NotCanceledState)
             {
-                // If there is no timer, then we're free to reset.  If there is a timer, then we need to first try
-                // to reset it to be infinite so that it won't fire, and then recognize that it could have already
-                // fired by the time we successfully changed it, and so check to see whether that's possibly the case.
-                // If we successfully reset it and it never fired, then we can be sure it won't trigger cancellation.
-                bool reset =
-                    _timer is not TimerQueueTimer timer ||
-                    (timer.Change(Timeout.UnsignedInfinite, Timeout.UnsignedInfinite) && !timer._everQueued);
+                bool reset = false;
+
+                try
+                {
+                    // If there is no timer, then we're free to reset.  If there is a timer, then we need to first try
+                    // to reset it to be infinite so that it won't fire, and then recognize that it could have already
+                    // fired by the time we successfully changed it, and so check to see whether that's possibly the case.
+                    // If we successfully reset it and it never fired, then we can be sure it won't trigger cancellation.
+                    reset = _timer is not TimerQueueTimer timer ||
+                            (timer.Change(Timeout.UnsignedInfinite, Timeout.UnsignedInfinite) && !timer._everQueued);
+                }
+                catch (ObjectDisposedException)
+                {
+                    // Just eat the exception. There is no other way to tell that
+                    // the timer has been disposed, and even if there were, there
+                    // would not be a good way to deal with the observe/dispose
+                    // race condition.
+                }
 
                 if (reset)
                 {