diff --git a/src/Velopack.Build/TaskOptionsMapper.cs b/src/Velopack.Build/TaskOptionsMapper.cs
index 7524d393..39ebb0ae 100644
--- a/src/Velopack.Build/TaskOptionsMapper.cs
+++ b/src/Velopack.Build/TaskOptionsMapper.cs
@@ -25,5 +25,5 @@ public static partial class TaskOptionsMapper
 
     private static RID StringToRID(string t) => RID.Parse(t);
 
-    private static DeltaMode StringToDeltaMode(string t) => (DeltaMode) Enum.Parse(typeof(DeltaMode), t);
+    private static DeltaMode StringToDeltaMode(string t) => (DeltaMode) Enum.Parse(typeof(DeltaMode), t, true);
 }