TSO LISTCAT output to dataset

I created a ds from RPF:

 HERC03.SYSPRINT.DATA                       
 --RECFM-LRECL-BLKSIZE-DSORG--DDNAME---DISP 
   FBA   121   1331    PS     O1       KEEP 
 --VOLUMES--                                
   PUB002              

Then did :

ALLOC FI(o1) da(sysprint.data)

Then tried :

LISTCAT OUTF(o1)

.. and get :

  ACTION ERROR ON HERC03.SYSPRINT.DATA                   
 ** RECORD X'F1C9C4C3C1' NOT WRITTEN.  LENGTH INVALID    
 UABORT CODE 36                                          

What record length is LISCTCAT outputting?

Mike