diff --git a/exercises/nucleotide-codons/tests/codons.rs b/exercises/nucleotide-codons/tests/codons.rs
index eaaeb89e4..f585d57e2 100644
--- a/exercises/nucleotide-codons/tests/codons.rs
+++ b/exercises/nucleotide-codons/tests/codons.rs
@@ -111,5 +111,5 @@ fn make_pairs() -> Vec<(&'static str, &'static str)> {
         }
     }
     pairs.sort_by(|&(_, a), &(_, b)| a.cmp(b));
-    return pairs;
+    pairs
 }