Not really half-way decent (which would be something like .01% distortion), but most function generators don't produce sines with half-way decent distortion either, so it might just work, not sure what the distortion specs are? I believe I verified something for harmonics below -55dB, but it was on a different scope. Hook it up, set the scope to FFT and check if the harmonics are significantly above the noise floor. If they are, you can adjust for lowest harmonic amplitude. If it's hard to see, I would just leave it, if it's reasonably close, no point in risking making it worse. Note that THD is based on the sum of squares of the amplitudes of the harmonics.