diff --git a/lib/delphi/src/Thrift.Protocol.Multiplex.pas b/lib/delphi/src/Thrift.Protocol.Multiplex.pas
index 93a3838..e5e0cd9 100644
--- a/lib/delphi/src/Thrift.Protocol.Multiplex.pas
+++ b/lib/delphi/src/Thrift.Protocol.Multiplex.pas
@@ -54,7 +54,7 @@
     {  Used to delimit the service name from the function name }
     SEPARATOR = ':';
 
-  private
+  strict private
      FServiceName : String;
 
   public