Scale of the sky sphere image ?

I generated an equirectangular image to be used as sky sphere. It’s all cool, except it feels out of scale when used in UE4 (I feel like a tiny ant against that sky). When viewing it in VR (using Oculus 360 Photos), it looks ok. In UE4 it looks too big.

Any idea how I can make it look like it’s in a proper scale? Thanks.