diff --git a/Bonsai.Editor/WorkflowRunner.cs b/Bonsai.Editor/WorkflowRunner.cs
index dae7dfca..8af0ae44 100644
--- a/Bonsai.Editor/WorkflowRunner.cs
+++ b/Bonsai.Editor/WorkflowRunner.cs
@@ -81,7 +81,7 @@ editorSettings.Tag is ExpressionBuilder builder &&
                 Application.Exit();
             }).Subscribe(
                 unit => { },
-                ex => { Console.WriteLine(ex); },
+                ex => { Console.Error.WriteLine(ex); },
                 () => { },
                 cts.Token);
             Application.Run();
@@ -93,7 +93,7 @@ static void RunHeadless(WorkflowBuilder workflowBuilder, Dictionary<string, stri
             var workflowCompleted = new ManualResetEvent(false);
             workflowBuilder.Workflow.BuildObservable().Subscribe(
                 unit => { },
-                ex => { Console.WriteLine(ex); workflowCompleted.Set(); },
+                ex => { Console.Error.WriteLine(ex); workflowCompleted.Set(); },
                 () => workflowCompleted.Set());
             workflowCompleted.WaitOne();
         }
diff --git a/Bonsai.Player/Program.cs b/Bonsai.Player/Program.cs
index 63a425b4..ee0d1aab 100644
--- a/Bonsai.Player/Program.cs
+++ b/Bonsai.Player/Program.cs
@@ -34,7 +34,7 @@ static void Main(string[] args)
             var workflowCompleted = new ManualResetEvent(false);
             workflowBuilder.Workflow.BuildObservable().Subscribe(
                 unit => { },
-                ex => { Console.WriteLine(ex); workflowCompleted.Set(); },
+                ex => { Console.Error.WriteLine(ex); workflowCompleted.Set(); },
                 () => workflowCompleted.Set());
             workflowCompleted.WaitOne();
         }