diff --git a/lib/operators/arithmetic.js b/lib/operators/arithmetic.js
index c5b0866..18eaf43 100644
--- a/lib/operators/arithmetic.js
+++ b/lib/operators/arithmetic.js
@@ -21,9 +21,7 @@ const lcm = (...list) => {
   return list.reduce(lcmPair);
 };
 
-const additionPair = (a, b, ...list) => {
-  return a + b;
-};
+const additionPair = (a, b) => a + b;
 
 const addition = (...list) => {
   if (list.length === 0) return 0;