diff --git a/src/lib/functions/quantify.spec.ts b/src/lib/functions/quantify.spec.ts
index 6491fa6..30dd6b0 100644
--- a/src/lib/functions/quantify.spec.ts
+++ b/src/lib/functions/quantify.spec.ts
@@ -3,7 +3,7 @@ import { quantify } from './quantify';
 
 describe('quantify', () => {
 
-  let value: number|string;
+  let value: number | string | undefined;
   let label: string;
 
   beforeEach( () => {
@@ -53,4 +53,4 @@ describe('quantify', () => {
     value = "432.00";
     expect(quantify(value, label)).toBe("432.00 cats")
   })
-})
\ No newline at end of file
+})