diff --git a/OpenRA.Mods.Common/Widgets/ExponentialSliderWidget.cs b/OpenRA.Mods.Common/Widgets/ExponentialSliderWidget.cs
index 9d452e6c4c..1c0b60dd53 100644
--- a/OpenRA.Mods.Common/Widgets/ExponentialSliderWidget.cs
+++ b/OpenRA.Mods.Common/Widgets/ExponentialSliderWidget.cs
@@ -19,6 +19,9 @@ namespace OpenRA.Mods.Common.Widgets
 		public double ExpA = 1.0e-3;
 		public double ExpB = 6.908;
 
+		public ExponentialSliderWidget()
+			: base() { }
+
 		public ExponentialSliderWidget(ExponentialSliderWidget other)
 			: base(other) { }