diff --git a/src/NSubstitute/Core/WhenCalled.cs b/src/NSubstitute/Core/WhenCalled.cs
index 8d956f60..35a637d8 100644
--- a/src/NSubstitute/Core/WhenCalled.cs
+++ b/src/NSubstitute/Core/WhenCalled.cs
@@ -1,4 +1,3 @@
-using System.Threading.Tasks;
 using NSubstitute.Routing;
 
 namespace NSubstitute.Core;
@@ -20,15 +19,15 @@ public void Do(Action<CallInfo> callbackWithArguments)
     }
 
     /// <summary>
-        /// Perform this action when called.
-        /// </summary>
-        /// <param name="callbackWithArguments"></param>
-        public void Do(Func<CallInfo, Task> callbackWithArguments)
-        {
-            Do(callInfo => callbackWithArguments(callInfo).GetAwaiter().GetResult());
-        }
+    /// Perform this action when called.
+    /// </summary>
+    /// <param name="callbackWithArguments"></param>
+    public void Do(Func<CallInfo, Task> callbackWithArguments)
+    {
+        Do(callInfo => callbackWithArguments(callInfo).GetAwaiter().GetResult());
+    }
 
-        /// <summary>
+    /// <summary>
     /// Perform this configured callback when called.
     /// </summary>
     /// <param name="callback"></param>
diff --git a/src/NSubstitute/Routing/Handlers/RaiseEventHandler.cs b/src/NSubstitute/Routing/Handlers/RaiseEventHandler.cs
index 76988cfd..464f3a9b 100644
--- a/src/NSubstitute/Routing/Handlers/RaiseEventHandler.cs
+++ b/src/NSubstitute/Routing/Handlers/RaiseEventHandler.cs
@@ -1,5 +1,4 @@
 using System.Reflection;
-using System.Threading.Tasks;
 using NSubstitute.Core;
 using NSubstitute.Exceptions;
 
@@ -27,7 +26,7 @@ public RouteAction Handle(ICall call)
 
             try
             {
-                    (handler.DynamicInvoke(eventArguments) as Task)?.GetAwaiter().GetResult();
+                (handler.DynamicInvoke(eventArguments) as Task)?.GetAwaiter().GetResult();
             }
             catch (TargetInvocationException e)
             {
diff --git a/tests/NSubstitute.Acceptance.Specs/Infrastructure/AnotherClass.cs b/tests/NSubstitute.Acceptance.Specs/Infrastructure/AnotherClass.cs
index 99a26f64..7ef9e3f0 100644
--- a/tests/NSubstitute.Acceptance.Specs/Infrastructure/AnotherClass.cs
+++ b/tests/NSubstitute.Acceptance.Specs/Infrastructure/AnotherClass.cs
@@ -8,12 +8,16 @@ public abstract class AnotherClass
 
     protected abstract string ProtectedMethod(string msg, int i, char j);
 
+    protected abstract string ProtectedMethod(string msg, params int[] numbers);
+
     protected abstract void ProtectedMethodWithNoReturn();
 
     protected abstract void ProtectedMethodWithNoReturn(int i);
 
     protected abstract void ProtectedMethodWithNoReturn(string msg, int i, char j);
 
+    protected abstract void ProtectedMethodWithNoReturn(string msg, params int[] numbers);
+
     public abstract void PublicVirtualMethod();
 
     protected void ProtectedNonVirtualMethod()
@@ -34,6 +38,11 @@ public string DoWork(string msg, int i, char j)
         return ProtectedMethod(msg, i, j);
     }
 
+    public string DoWork(string msg, params int[] numbers)
+    {
+        return ProtectedMethod(msg, numbers);
+    }
+
     public void DoVoidWork()
     {
         ProtectedMethodWithNoReturn();
@@ -48,4 +57,9 @@ public void DoVoidWork(string msg, int i, char j)
     {
         ProtectedMethodWithNoReturn(msg, i, j);
     }
+
+    public void DoVoidWork(string msg, params int[] numbers)
+    {
+        ProtectedMethodWithNoReturn(msg, numbers);
+    }
 }
\ No newline at end of file
diff --git a/tests/NSubstitute.Acceptance.Specs/ProtectedExtensionsTests.cs b/tests/NSubstitute.Acceptance.Specs/ProtectedExtensionsTests.cs
index ba5a932b..c144d052 100644
--- a/tests/NSubstitute.Acceptance.Specs/ProtectedExtensionsTests.cs
+++ b/tests/NSubstitute.Acceptance.Specs/ProtectedExtensionsTests.cs
@@ -46,6 +46,19 @@ public void Should_mock_and_verify_protected_method_with_multiple_args()
         sub.Received(1).Protected("ProtectedMethod", Arg.Any<string>(), Arg.Any<int>(), Arg.Any<char>());
     }
 
+    [Test]
+    public void Should_mock_and_verify_protected_method_with_params_arg()
+    {
+        var expectedMsg = "unit test message";
+        var sub = Substitute.For<AnotherClass>();
+        var worker = new Worker();
+
+        sub.Protected("ProtectedMethod", Arg.Any<string>(), Arg.Any<int[]>()).Returns(expectedMsg);
+
+        Assert.That(worker.DoWorkWithParams(sub, 3, 5), Is.EqualTo(expectedMsg));
+        sub.Received(1).Protected("ProtectedMethod", Arg.Any<string>(), Arg.Any<int[]>());
+    }
+
     [Test]
     public void Should_throw_on_mock_null_substitute()
     {
@@ -136,6 +149,20 @@ public void Should_mock_and_verify_void_method_with_multiple_args()
         sub.Received(1).Protected("ProtectedMethodWithNoReturn", Arg.Any<string>(), Arg.Any<int>(), Arg.Any<char>());
     }
 
+    [Test]
+    public void Should_mock_and_verify_void_method_with_params_arg()
+    {
+        var count = 0;
+        var sub = Substitute.For<AnotherClass>();
+        var worker = new Worker();
+
+        sub.When("ProtectedMethodWithNoReturn", Arg.Any<string>(), Arg.Any<int[]>()).Do(x => count++);
+
+        worker.DoVoidWork(sub, 6, 9);
+        Assert.That(count, Is.EqualTo(1));
+        sub.Received(1).Protected("ProtectedMethodWithNoReturn", Arg.Any<string>(), Arg.Any<int[]>());
+    }
+
     [Test]
     public void Should_throw_on_void_method_null_substitute()
     {
@@ -201,6 +228,11 @@ internal string DoEvenMoreWork(AnotherClass worker, int i, char j)
             return worker.DoWork("worker", i, j);
         }
 
+        internal string DoWorkWithParams(AnotherClass worker, params int[] numb)
+        {
+            return worker.DoWork("worker", numb);
+        }
+
         internal void DoVoidWork(AnotherClass worker)
         {
             worker.DoVoidWork();
@@ -215,5 +247,10 @@ internal void DoVoidWork(AnotherClass worker, int i, char j)
         {
             worker.DoVoidWork("void worker", i, j);
         }
+
+        internal void DoVoidWork(AnotherClass worker, params int[] numb)
+        {
+            worker.DoVoidWork("void worker", numb);
+        }
     }
 }
\ No newline at end of file