  The distinguishing index $D'(G)$ of a graph $G$ is the least number of
colours needed in an edge colouring which is not preserved by any non-trivial
automorphism. Broere and Pil\'sniak conjectured that if every non-trivial
automorphism of a countable graph $G$ moves infinitely many edges, then $D'(G)
\leq 2$. We prove this conjecture.
