Attempting to ALTER INDEX TO CLUSTER on Primary Key

So what's wrong? I'm attempting to use ALTER INDEX TO CLUSTER to reorganize a table. The table definition includes a PRIMARY KEY and two other indexes but the primary key would appear to be the best candidate for the ALTER. The table definition looks like: create table client_dob ( client_rsn INTEGER not null, client_dob_rsn INTEGER not null, dob DATE not null, validated SMALLINT default 0 , active_cd CHAR(1) check (active_cd is null or (active_cd in ("I","A"))) constraint CKC_ACTIVE_C_992, add_date DATETIME YEAR TO SECOND , add_userid INTEGER , mod_date DATETIME YEAR TO SECOND , mod_userid INTEGER , primary key (client_dob_rsn) constraint pk_107 ) extent size 16next size 16 lock mode row ; When I check the SYSINDEXES table I see an index name of 280_1305 with what appears to be a space in front of the '280'. I have yet to determine how to use this index name in the alter statement. All the attempts listed below fail: ALTER INDEX 280_1305 TO CLUSTERALTER INDEX ' 280_1305' TO CLUSTER ALTER INDEX " 280_1305" TO CLUSTER