diff --git a/tests/Avalonia.Markup.UnitTests/Properties/AssemblyInfo.cs b/tests/Avalonia.Markup.UnitTests/Properties/AssemblyInfo.cs
index 8adae73fff..4c3825ed44 100644
--- a/tests/Avalonia.Markup.UnitTests/Properties/AssemblyInfo.cs
+++ b/tests/Avalonia.Markup.UnitTests/Properties/AssemblyInfo.cs
@@ -37,5 +37,4 @@ using Xunit;
 [assembly: AssemblyFileVersion("1.0.0.0")]
 
 // Don't run tests in parallel.
-[assembly: CollectionBehavior(DisableTestParallelization = true)]
 [assembly: CollectionBehavior(MaxParallelThreads = 1)]