diff --git a/tests/FSharpLint.Core.Tests/Rules/Conventions/FailwithBadUsage.fs b/tests/FSharpLint.Core.Tests/Rules/Conventions/FailwithBadUsage.fs
index fdec0ba3a..54fe2a9d3 100644
--- a/tests/FSharpLint.Core.Tests/Rules/Conventions/FailwithBadUsage.fs
+++ b/tests/FSharpLint.Core.Tests/Rules/Conventions/FailwithBadUsage.fs
@@ -6,6 +6,7 @@ open FSharpLint.Rules
 open FSharpLint.Core.Tests
 
 [<TestFixture>]
+[<NonParallelizable>]
 type TestConventionsFailwithBadUsage() =
     inherit TestAstNodeRuleBase.TestAstNodeRuleBase(FailwithBadUsage.rule)