fix compile error
fix compile error

StephanEggermont/metacello-work,dalehenrich/metacello-work,demarey/metacello-work,krono/metacello-work,demarey/metacello-work,seandenigris/metacello-work,pharo-project/pharo-metacello,StephanEggermont/metacello-work,dalehenrich/metacello-work,krono/metacello-work,pharo-project/pharo-metacello,seandenigris/metacello-work,Metacello/metacello