diff --git a/CHANGELIST.md b/CHANGELIST.md
index dc035cdc..2366fba0 100644
--- a/CHANGELIST.md
+++ b/CHANGELIST.md
@@ -38,6 +38,7 @@
 - Remove Chime
 - Move string contents for UI to view model
 - Remove unused byte array constant
+- Fix net20, net35, and net40
 
 ### 3.1.9a (2024-05-21)
 
diff --git a/MPF.Core/UI/ViewModels/MainViewModel.cs b/MPF.Core/UI/ViewModels/MainViewModel.cs
index fdc0ebc9..7e6dd987 100644
--- a/MPF.Core/UI/ViewModels/MainViewModel.cs
+++ b/MPF.Core/UI/ViewModels/MainViewModel.cs
@@ -1917,7 +1917,7 @@ namespace MPF.Core.UI.ViewModels
         /// Handler for Result ProgressChanged event
         /// </summary>
 #if NET20 || NET35 || NET40
-        private void ProgressUpdated(object? sender, BaseExecutionContext.StringEventArgs value)
+        private void ProgressUpdated(object? sender, Core.ExecutionContexts.BaseExecutionContext.StringEventArgs value)
 #else
         private void ProgressUpdated(object? sender, string value)
 #endif