diff --git a/src/Avalonia.Animation/KeySpline.cs b/src/Avalonia.Animation/KeySpline.cs
index f20f3be563..59d7132f7c 100644
--- a/src/Avalonia.Animation/KeySpline.cs
+++ b/src/Avalonia.Animation/KeySpline.cs
@@ -340,20 +340,4 @@ namespace Avalonia.Animation
             }
         }
     }
-
-    /// <summary>
-    /// Converts string values to <see cref="KeySpline"/> values
-    /// </summary>
-    public class KeySplineTypeConverter : TypeConverter
-    {
-        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
-        {
-            return sourceType == typeof(string);
-        }
-
-        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
-        {
-            return KeySpline.Parse((string)value, culture);
-        }
-    }
 }
diff --git a/src/Avalonia.Animation/KeySplineTypeConverter.cs b/src/Avalonia.Animation/KeySplineTypeConverter.cs
new file mode 100644
index 0000000000..cd7427a37d
--- /dev/null
+++ b/src/Avalonia.Animation/KeySplineTypeConverter.cs
@@ -0,0 +1,25 @@
+using System;
+using System.ComponentModel;
+using System.Globalization;
+
+// Ported from WPF open-source code.
+// https://github.com/dotnet/wpf/blob/ae1790531c3b993b56eba8b1f0dd395a3ed7de75/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/Animation/KeySpline.cs
+
+namespace Avalonia.Animation
+{
+    /// <summary>
+    /// Converts string values to <see cref="KeySpline"/> values
+    /// </summary>
+    public class KeySplineTypeConverter : TypeConverter
+    {
+        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
+        {
+            return sourceType == typeof(string);
+        }
+
+        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
+        {
+            return KeySpline.Parse((string)value, culture);
+        }
+    }
+}