Ethylammonium nitrate is one of the simplest protic ionic liquids (PILs). Similarly to water, it acts both as a H-bonding acceptor and donor, although, due to its chemical structure, it cannot organise in the same tetrahedrally structured network of water.This salt is characterised by an inherent amphiphilic structure that eventually leads to the development of a mesoscopical segregation of ethyl chains in a sponge-like organization.How this complex morphology is affected by addition of polar molecules is still a matter of debate. Among the most common polar solvents dimethylsulfoxide has strong capability of developing extensive H-bonding interactions and as such is supposed to affect EAN's bulk structure.We propose to explore the structure of EAN-DMSO by means of neutron diffraction, thus complementing our high energy x-ray data, at ambient temperature, at four selected c's.