Easy way to scale screen?

I currently draw to a RenderTarget2D and then scale and draw that RenderTarget2D to my screen. This works out fine, but if my player walks 0.5 pixels and my screensize is 2x that i want the player to walk 1 pixel. Currently it produces this “bug” (see picture). Help greatly appreciated!

I ended up using a scale matrix when drawing to the RenderTexture.