French-language broadcaster RTBF was in charge of the selection of the Belgian entry for the 1988 Contest. The national final was held at the RTBF studios, hosted by Patrick Duhamel. The winner was chosen by an expert jury and a public jury. The full results of the voting were not made public, and only the winning song was announced.
On the night of the final Reynaert performed 16th in the running order, following Norway and preceding Luxembourg. At the close of the voting "Laissez briller le soleil" had received 5 points (all from France), placing Belgium joint 18th (with Portugal) of the 21 entries. The Belgian jury awarded its 12 points to the United Kingdom.