[fpc-pascal] Hint converting to int64

[Santiago A.]

Hello:
FPC: 3.0.4 (Realease from Lazarus 1.8.4 SVN: 57972)
OS: Windows7 32bits / Linux 64Bits

I have this code and I get a hint

---------- var  Entity:Longword;FullParagraph:string; pIni:Integer; 
begin .... Entity:=Entity*10+ord(FullParagraph[pIni])-48; // <=== Hint 
.... end; -----------

Hint: Converting the operands to "Int64" before doing the add could 
prevent overflow errors.
I can't see why it mentions int64, there are integer and longword 
variables, but no Int64 one.

I have replaced it by

Entity:=Entity*10+LongWord(ord(FullParagraph[pIni]))-48;

That is, I have casted the result of "ord()" to longword. But I get the 
same hint.
What should I do to remove the hint?


-- 
Saludos

Santiago A.