diff --git a/mcs/class/corlib/System.Threading.Tasks/Future.cs b/mcs/class/corlib/System.Threading.Tasks/Future.cs
index 5ff47a0343d8a..f9937df50b307 100644
--- a/mcs/class/corlib/System.Threading.Tasks/Future.cs
+++ b/mcs/class/corlib/System.Threading.Tasks/Future.cs
@@ -63,19 +63,19 @@ public Task (Func<TResult> function) : this (function, TaskCreationOptions.None)
 		}
 		
 		public Task (Func<TResult> function, CancellationToken cancellationToken)
-			: this ((o) => function (), null, cancellationToken, TaskCreationOptions.None)
+			: this (function == null ? (Func<object, TResult>)null : (o) => function(), null, cancellationToken, TaskCreationOptions.None)
 		{
 			
 		}
 		
 		public Task (Func<TResult> function, TaskCreationOptions creationOptions)
-			: this ((o) => function (), null, CancellationToken.None, creationOptions)
+			: this (function == null ? (Func<object, TResult>)null : (o) => function(), null, CancellationToken.None, creationOptions)
 		{
 			
 		}
 		
 		public Task (Func<TResult> function, CancellationToken cancellationToken, TaskCreationOptions creationOptions)
-			: this ((o) => function (), null, cancellationToken, creationOptions)
+			: this (function == null ? (Func<object, TResult>)null : (o) => function(), null, cancellationToken, creationOptions)
 		{
 			
 		}