diff --git a/csharp/src/Google.Protobuf/WritingPrimitives.cs b/csharp/src/Google.Protobuf/WritingPrimitives.cs
index 03c764098128..56f3990cd781 100644
--- a/csharp/src/Google.Protobuf/WritingPrimitives.cs
+++ b/csharp/src/Google.Protobuf/WritingPrimitives.cs
@@ -209,7 +209,7 @@ public static void WriteString(ref Span<byte> buffer, ref WriterInternalState st
             }
         }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        //[MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static int WriteStringToBuffer(Span<byte> buffer, ref WriterInternalState state, string value)
         {
 #if NETSTANDARD1_1