schema module reports a mismatch

column idx:
declared: array('type' => 'float', 'unsigned' => TRUE, 'not null' => TRUE, 'precision' => 30, 'scale' => 20)
actual: array('type' => 'float', 'unsigned' => TRUE, 'not null' => TRUE, 'disp-width' => '30')
column idx:
declared: array('type' => 'float', 'unsigned' => TRUE, 'not null' => TRUE, 'precision' => 30, 'scale' => 20)
actual: array('type' => 'float', 'unsigned' => TRUE, 'not null' => TRUE, 'disp-width' => '30')

how to do?
thank you