avoid race condition in mapbench that triggers some bug in mscan
avoid race condition in mapbench that triggers some bug in mscan

bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,aclements/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6