Make RIGHT channel quieter than LEFT channel

Hi,

I have a MONO line level (signal and GND) and I want to create L and R channel from it (to output sound to 2 separate speaker) BUT I want to be able to control the volume of the R channel.

Creating L and R is pretty easy, I just connected the signal line (from the MONO line level) directly to L and R of my amp and it works fine (I connected GND too, of course). Whenever there is sound in the MONO line level, both L and R speaker play the sound perfectly.

To be able to control the R channel in order to be able to make it quieter I took a 1k potentiometer and soldered it like below:

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This works fine, I mean, whenever I rotate the potentiometer, the R channel gets quieter and quieter according to the potentiometer position. HOWEVER I realized that when I rotate the potentiometer, the L channel changes a bit the sound too, not as much as R but it still gets its volume changed... How can I prevent this? How can I control R channel volume without affecting the L channel?