diff --git a/src/MediatR/Pipeline/IRequestExceptionAction.cs b/src/MediatR/Pipeline/IRequestExceptionAction.cs
index 4eb8a201..f385594b 100644
--- a/src/MediatR/Pipeline/IRequestExceptionAction.cs
+++ b/src/MediatR/Pipeline/IRequestExceptionAction.cs
@@ -29,7 +29,7 @@ public interface IRequestExceptionAction<in TRequest, in TException>
     ///     <see cref="IRequestExceptionAction{TRequest, TException}" /> interface.
     /// </summary>
     /// <typeparam name="TRequest">The type of failed request</typeparam>
-    public interface IRequestExceptionAction<TRequest> : IRequestExceptionAction<TRequest, Exception>
+    public interface IRequestExceptionAction<in TRequest> : IRequestExceptionAction<TRequest, Exception>
     {
     }