diff --git a/src/System.Runtime/ref/System.Runtime.cs b/src/System.Runtime/ref/System.Runtime.cs
index ca154ab9dca4..bfd34ca190b4 100644
--- a/src/System.Runtime/ref/System.Runtime.cs
+++ b/src/System.Runtime/ref/System.Runtime.cs
@@ -3728,7 +3728,7 @@ protected OwnedMemory() { }
         public abstract System.Span<T> Span { get; }
         public void Dispose() { }
         protected abstract void Dispose(bool disposing);
-        public abstract MemoryHandle Pin(int offset = 0);
+        public abstract MemoryHandle Pin(int offset=0);
         public abstract bool Release();
         public abstract void Retain();
         protected internal abstract bool TryGetArray(out System.ArraySegment<T> arraySegment);