diff --git a/lib/delphi/src/Thrift.Protocol.JSON.pas b/lib/delphi/src/Thrift.Protocol.JSON.pas
index 2a9682c..5be7ae0 100644
--- a/lib/delphi/src/Thrift.Protocol.JSON.pas
+++ b/lib/delphi/src/Thrift.Protocol.JSON.pas
@@ -1257,8 +1257,8 @@
 // Return the minimum number of bytes a type will consume on the wire
 begin
   case aType of
-    TType.Stop:    result := 0;
-    TType.Void:    result := 0;
+    TType.Stop:    result := 1;  // T_STOP needs to count itself
+    TType.Void:    result := 1;  // T_VOID needs to count itself
     TType.Bool_:   result := 1;
     TType.Byte_:   result := 1;
     TType.Double_: result := 1;