Troubleshooting "Illegal mix of collations" error in mysql

Am getting the below error when trying to do a select through a stored procedure in MySQL. > Illegal mix of collations (latin1_general_cs,IMPLICIT) and (latin1_general_ci,IMPLICIT) for operation '=' Any idea on what might be going wrong here? The collation of the table is `latin1_general_ci` and that of the column in the where clause is `latin1_general_cs`.