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[netcdfgroup] netcdf-4 operation on netcdf-3 file

Dear all,
after upgrading to netcdf 4.6, I get an error when trying to convert a netcdf 3 
file with nccopy:

nccopy -k netCDF-4 -d 1 -s infile.nc outfile.nc
NetCDF: Attempting netcdf-4 operation on netcdf-3 file
Location: file /tmp/netcdf-20180128-10064-v1ucrs/netcdf-4.6.0/ncdump/nccopy.c; 
line 1060

Am I doing something wrong? This used to work fine with older versions of 
netcdf.

Cheers,
Jan