Add Icon To ViewPart?

I'm trying to add an icon to the ribbon button for my add-on, I did the following:

[ViewPart(
        Id = "MyViewPart",
        Name = "MyView Show Panel",
        Description = "Display my own panel",
        Icon = "my_icon"
        )]

In the resources I added an icon named my_icon, but there is still just no icon besides the "Name" text of the Viewpart. What do I need to change?

Kind regards

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