diff --git a/Core/Cleipnir.ResilientFunctions.Tests/InMemoryTests/RFunctionTests/ActivitiesTests.cs b/Core/Cleipnir.ResilientFunctions.Tests/InMemoryTests/RFunctionTests/ActivitiesTests.cs
index 40bc74dc..cb0af548 100644
--- a/Core/Cleipnir.ResilientFunctions.Tests/InMemoryTests/RFunctionTests/ActivitiesTests.cs
+++ b/Core/Cleipnir.ResilientFunctions.Tests/InMemoryTests/RFunctionTests/ActivitiesTests.cs
@@ -31,4 +31,8 @@ public override Task ExceptionThrowingActionTest()
     [TestMethod]
     public override Task TaskWhenAnyFuncTest()
         => TaskWhenAnyFuncTest(new InMemoryFunctionStore().CastTo<IFunctionStore>().ToTask());
+
+    [TestMethod]
+    public override Task ClearActivityTest()
+        => ClearActivityTest(new InMemoryFunctionStore().CastTo<IFunctionStore>().ToTask());
 }
\ No newline at end of file
diff --git a/Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/RFunctionTests/ActivitiesTests.cs b/Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/RFunctionTests/ActivitiesTests.cs
index 6f14e7d3..c6dbc150 100644
--- a/Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/RFunctionTests/ActivitiesTests.cs
+++ b/Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/RFunctionTests/ActivitiesTests.cs
@@ -250,4 +250,39 @@ async Task<int> (string param, Context context) =>
         storedActivity.WorkStatus.ShouldBe(WorkStatus.Completed);
         storedActivity.Result!.DeserializeFromJsonTo<int>().ShouldBe(2);
     }
+    
+    public abstract Task ClearActivityTest();
+    public async Task ClearActivityTest(Task<IFunctionStore> storeTask)
+    {
+        var store = await storeTask;
+        using var rFunctions = new RFunctions(store);
+        var functionId = TestFunctionId.Create();
+        var (functionTypeId, functionInstanceId) = functionId;
+
+        await store.CreateFunction(
+            functionId,
+            Test.SimpleStoredParameter,
+            Test.SimpleStoredScrapbook,
+            leaseExpiration: DateTime.Now.Ticks,
+            postponeUntil: null,
+            timestamp: DateTime.Now.Ticks
+        );
+        
+        var registration = rFunctions.RegisterAction(
+            functionTypeId,
+            async Task (string param, Context context) =>
+            {
+                var (activities, _) = context;
+                await activities.Clear("SomeActivity");
+            });
+
+        var controlPanel = await registration.ControlPanel(functionId.InstanceId);
+        controlPanel.ShouldNotBeNull();
+
+        await controlPanel.Activities.SetSucceeded("SomeActivity");
+        await controlPanel.ReInvoke();
+
+        await controlPanel.Refresh();
+        controlPanel.Activities.All.Count.ShouldBe(0);
+    }
 }
\ No newline at end of file
diff --git a/Core/Cleipnir.ResilientFunctions.Tests/Utils/Test.cs b/Core/Cleipnir.ResilientFunctions.Tests/Utils/Test.cs
index 71ca29fc..6f6956e7 100644
--- a/Core/Cleipnir.ResilientFunctions.Tests/Utils/Test.cs
+++ b/Core/Cleipnir.ResilientFunctions.Tests/Utils/Test.cs
@@ -7,7 +7,7 @@ namespace Cleipnir.ResilientFunctions.Tests.Utils;
 public static class Test
 {
     public static StoredParameter SimpleStoredParameter { get; } = 
-        new(ParamJson: "hello world", ParamType: typeof(string).SimpleQualifiedName());
+        new(ParamJson: "hello world".ToJson(), ParamType: typeof(string).SimpleQualifiedName());
 
     public static StoredScrapbook SimpleStoredScrapbook { get; }
         = new(ScrapbookJson: new RScrapbook().ToJson(), ScrapbookType: typeof(RScrapbook).SimpleQualifiedName());
diff --git a/Core/Cleipnir.ResilientFunctions/Domain/Activities.cs b/Core/Cleipnir.ResilientFunctions/Domain/Activities.cs
index f5c04228..e3cedb29 100644
--- a/Core/Cleipnir.ResilientFunctions/Domain/Activities.cs
+++ b/Core/Cleipnir.ResilientFunctions/Domain/Activities.cs
@@ -146,6 +146,17 @@ await _activityStore.SetActivityResult(
 
         return result;
     }
+
+    public async Task Clear(string id)
+    {
+        lock (_sync)
+            if (!_activityResults.ContainsKey(id))
+                return;
+        
+        await _activityStore.DeleteActivityResult(_functionId, id);
+        lock (_sync)
+            _activityResults.Remove(id);
+    }
     
     public Task<T> WhenAny<T>(string id, params Task<T>[] tasks)
         => Do(id, async () => await await Task.WhenAny(tasks));
diff --git a/Stores/AzureBlob/Cleipnir.ResilientFunctions.AzureBlob.Tests/RFunctionTests/ActivitiesTests.cs b/Stores/AzureBlob/Cleipnir.ResilientFunctions.AzureBlob.Tests/RFunctionTests/ActivitiesTests.cs
index eb87bb1c..a6d06ae9 100644
--- a/Stores/AzureBlob/Cleipnir.ResilientFunctions.AzureBlob.Tests/RFunctionTests/ActivitiesTests.cs
+++ b/Stores/AzureBlob/Cleipnir.ResilientFunctions.AzureBlob.Tests/RFunctionTests/ActivitiesTests.cs
@@ -29,4 +29,8 @@ public override Task ExceptionThrowingActionTest()
     [TestMethod]
     public override Task TaskWhenAnyFuncTest()
         => TaskWhenAnyFuncTest(FunctionStoreFactory.Create());
+
+    [TestMethod]
+    public override Task ClearActivityTest()
+        => ClearActivityTest(FunctionStoreFactory.Create());
 }
\ No newline at end of file
diff --git a/Stores/MySQL/Cleipnir.ResilientFunctions.MySQL.Tests/RFunctionTests/ActivitiesTests.cs b/Stores/MySQL/Cleipnir.ResilientFunctions.MySQL.Tests/RFunctionTests/ActivitiesTests.cs
index e44870bb..55b80531 100644
--- a/Stores/MySQL/Cleipnir.ResilientFunctions.MySQL.Tests/RFunctionTests/ActivitiesTests.cs
+++ b/Stores/MySQL/Cleipnir.ResilientFunctions.MySQL.Tests/RFunctionTests/ActivitiesTests.cs
@@ -28,4 +28,8 @@ public override Task ExceptionThrowingActionTest()
     [TestMethod]
     public override Task TaskWhenAnyFuncTest()
         => TaskWhenAnyFuncTest(FunctionStoreFactory.Create());
+    
+    [TestMethod]
+    public override Task ClearActivityTest()
+        => ClearActivityTest(FunctionStoreFactory.Create());
 }
\ No newline at end of file
diff --git a/Stores/PostgreSQL/Cleipnir.ResilientFunctions.PostgreSQL.Tests/RFunctionTests/ActivitiesTests.cs b/Stores/PostgreSQL/Cleipnir.ResilientFunctions.PostgreSQL.Tests/RFunctionTests/ActivitiesTests.cs
index 59e1e00b..5e3e490d 100644
--- a/Stores/PostgreSQL/Cleipnir.ResilientFunctions.PostgreSQL.Tests/RFunctionTests/ActivitiesTests.cs
+++ b/Stores/PostgreSQL/Cleipnir.ResilientFunctions.PostgreSQL.Tests/RFunctionTests/ActivitiesTests.cs
@@ -29,4 +29,8 @@ public override Task ExceptionThrowingActionTest()
     [TestMethod]
     public override Task TaskWhenAnyFuncTest()
         => TaskWhenAnyFuncTest(FunctionStoreFactory.Create());
+    
+    [TestMethod]
+    public override Task ClearActivityTest()
+        => ClearActivityTest(FunctionStoreFactory.Create());
 }
\ No newline at end of file
diff --git a/Stores/SqlServer/Cleipnir.ResilientFunctions.SqlServer.Tests/ActivitiesTests.cs b/Stores/SqlServer/Cleipnir.ResilientFunctions.SqlServer.Tests/ActivitiesTests.cs
index 7f7e2574..42845901 100644
--- a/Stores/SqlServer/Cleipnir.ResilientFunctions.SqlServer.Tests/ActivitiesTests.cs
+++ b/Stores/SqlServer/Cleipnir.ResilientFunctions.SqlServer.Tests/ActivitiesTests.cs
@@ -29,4 +29,8 @@ public override Task ExceptionThrowingActionTest()
     [TestMethod]
     public override Task TaskWhenAnyFuncTest()
         => TaskWhenAnyFuncTest(FunctionStoreFactory.Create());
+    
+    [TestMethod]
+    public override Task ClearActivityTest()
+        => ClearActivityTest(FunctionStoreFactory.Create());
 }
\ No newline at end of file