diff --git a/packages/jaeger-ui-components/src/common/CopyIcon.test.js b/packages/jaeger-ui-components/src/common/CopyIcon.test.tsx
similarity index 97%
rename from packages/jaeger-ui-components/src/common/CopyIcon.test.js
rename to packages/jaeger-ui-components/src/common/CopyIcon.test.tsx
index b06ac040043..9f0101501f1 100644
--- a/packages/jaeger-ui-components/src/common/CopyIcon.test.js
+++ b/packages/jaeger-ui-components/src/common/CopyIcon.test.tsx
@@ -26,7 +26,7 @@ describe('<CopyIcon />', () => {
     copyText: 'copyTextValue',
     tooltipTitle: 'tooltipTitleValue',
   };
-  let copySpy;
+  let copySpy: jest.SpyInstance;
 
   beforeAll(() => {
     copySpy = jest.spyOn(copy, 'default');