diff --git a/src/Orleans.Core.Abstractions/Core/Grain.cs b/src/Orleans.Core.Abstractions/Core/Grain.cs
index 7c2ad0a7d2..5d310bdfff 100644
--- a/src/Orleans.Core.Abstractions/Core/Grain.cs
+++ b/src/Orleans.Core.Abstractions/Core/Grain.cs
@@ -95,7 +95,7 @@ protected Grain(IGrainContext grainContext, IGrainRuntime? grainRuntime = null)
/// Period of subsequent timer ticks.
/// Handle for this Timer.
///
- protected IDisposable RegisterTimer(Func