diff --git a/src/DnsClient/TaskExtensions.cs b/src/DnsClient/TaskExtensions.cs
index a60fd1f2..40a7f057 100644
--- a/src/DnsClient/TaskExtensions.cs
+++ b/src/DnsClient/TaskExtensions.cs
@@ -15,6 +15,10 @@ public static async Task<T> WithCancellation<T>(this Task<T> task, CancellationT
                         onCancel();
                     }
                     catch { }
+                    
+                    // observe the exception to avoid "System.AggregateException: A Task's exception(s) were
+                    // not observed either by Waiting on the Task or accessing its Exception property."
+                    task.ContinueWith(t => t.Exception);
                     throw new OperationCanceledException(cancellationToken);
                 }
             }
@@ -22,4 +26,4 @@ public static async Task<T> WithCancellation<T>(this Task<T> task, CancellationT
             return await task.ConfigureAwait(false);
         }
     }
-}
\ No newline at end of file
+}