[TYPO3] alias input limited to 20 characters

[hartmut]

Hi,

I'm having a problem with the input field for the page alias in the 
backend (Typo3 4.1.2).
The input is limited to 20 characters. But looking at the database, in 
table pages the alias field is set to varchar 32.

How can I fix that?

best regards
hartmut