diff --git a/Common.ruleset b/Common.ruleset
index 91d686381d..1d8f1d9a49 100644
--- a/Common.ruleset
+++ b/Common.ruleset
@@ -134,7 +134,7 @@
 		<Rule Id="CA1063" Action="Hidden" />
 
 		<!-- Exceptions should be public -->
-		<Rule Id="CA1064" Action="Hidden" />
+		<Rule Id="CA1064" Action="Error" />
 
 		<!-- Do not raise exceptions in unexpected locations -->
 		<Rule Id="CA1065" Action="Hidden" />
diff --git a/src/BizHawk.Emulation.DiscSystem/DiscJob.cs b/src/BizHawk.Emulation.DiscSystem/DiscJob.cs
index 56a7bf0245..6c2c77c2cf 100644
--- a/src/BizHawk.Emulation.DiscSystem/DiscJob.cs
+++ b/src/BizHawk.Emulation.DiscSystem/DiscJob.cs
@@ -55,7 +55,7 @@ namespace BizHawk.Emulation.DiscSystem
 		public abstract void Run();
 	}
 
-	internal class DiscJobAbortException : Exception
+	public sealed class DiscJobAbortException : Exception
 	{
 	}
 }
\ No newline at end of file