diff --git a/src/calculateRentalCost.js b/src/calculateRentalCost.js
index 373d51c60..8882f2504 100644
--- a/src/calculateRentalCost.js
+++ b/src/calculateRentalCost.js
@@ -5,7 +5,7 @@
  */
 
 function calculateRentalCost(days) {
-  const longTerm = 7;
+  const LONG_TERM = 7;
   const longTermDiscount = 50;
   const smallTerm = 3;
   const smallTermDiscount = 20;