diff --git a/src/Avalonia.Visuals/Media/Color.cs b/src/Avalonia.Visuals/Media/Color.cs
index e974bbb100..aa730b3219 100644
--- a/src/Avalonia.Visuals/Media/Color.cs
+++ b/src/Avalonia.Visuals/Media/Color.cs
@@ -258,7 +258,7 @@ namespace Avalonia.Media
         public override string ToString()
         {
             uint rgb = ToUint32();
-            return KnownColors.GetKnownColorName(rgb) ?? $"#{rgb:x8}";
+            return KnownColors.GetKnownColorName(rgb) ?? $"#{rgb.ToString("x8", CultureInfo.InvariantCulture)}";
         }
 
         /// <summary>