Turntable, pre-phono and XS 2 GND connections

Hi, I have an old JVC turntable with built-in RCA cables, but no GND cable. I have an Ifi ZEN pre-phono connected via the AUX-1 RCA connectors to the XS 2. Unfortunately, when I rise the volume above “9 hours”, I start hearing a buzz. When this turntable was connected to an old integrated amplifier with a pre-phono input, no buzz was audible. I am wondering if it safe and/or advisable to connect the GND knob of the Ifi ZEN pre-phono to the GND knob of the XS 2 (I have an RCA+GND spare cable). Would it solve the buzz issue? Thank you for your suggestions and sorry for this elementary question…

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