In this paper we demonstrate that pressure for robustness combined with function sets containing redundant genes can cause an evolutionary system to avoid a more fit solution in favor of a more robust solution. It is also shown that this trend depends significantly on the mutation rate used. Categories and Subject Descriptors I.2.2 [Artificial Intelligence]: Automatic Programming-program synthesis General Terms Genetic robustness Keywords Bloat, code bloat, robustness, redundant genes