I tried:
-wal USERNAME -worker test -gpus 2 -tstop 72 -tstart 60 -pass a=ethash -proto 2 -pool stratum+tcp://prohashing.com:3339
-wal USERNAME -worker test -gpus 2 -tstop 72 -tstart 60 -pass a=ethash,c=ethereum -proto 2 -pool stratum+tcp://prohashing.com:3339

Hope someone help me.