diff --git a/app/models/Mortgage.test.ts b/app/models/Mortgage.test.ts
index 395131d..e3da8ab 100644
--- a/app/models/Mortgage.test.ts
+++ b/app/models/Mortgage.test.ts
@@ -18,7 +18,7 @@ it("correctly calculates the amount of the mortgage ", () => {
     initialDeposit: 0.1,
   });
 
-  expect(mortgage.principle).toBeCloseTo(90);
+  expect(mortgage.principal).toBeCloseTo(90);
 });
 
 it("correctly calculates the amount of monthly payment ", () => {