diff --git a/src/Draco.JsonRpc/JsonRpcConnection.cs b/src/Draco.JsonRpc/JsonRpcConnection.cs
index a8a9cb965..0c7b5406e 100644
--- a/src/Draco.JsonRpc/JsonRpcConnection.cs
+++ b/src/Draco.JsonRpc/JsonRpcConnection.cs
@@ -165,6 +165,7 @@ bool IsMutating(TMessage message)
             }
             else
             {
+                currentTasks.RemoveAll(t => t.IsCompleted);
                 currentTasks.Add(this.ProcessMessageAsync(message));
             }
         }