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ERA5, get specific humidity

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I am a MPAS user. I download the ERA5 data with variable specific humidity. And I want to use ungrib to get the intermediate file with specific humidity. However, As far as I know, the ungrib will change the specific humidity into relative humidity(RH). I want to just retain the SPECHUMD in my intermediate file. How can I do it? Thanks!
Could you attach the Vtable that you're using with the ungrib program, and could you also attach the output when the g2print utility program (assuming the ERA5 data you download are in GRIB2 format; otherwise, the output from g1print) is run on one of your ERA5 files? It should be possible to get SPECHUMD and not RH in your intermediate files, but it may be a matter of making adjustments to the Vtable.