diff --git a/test/cases/postSkipSegments.ts b/test/cases/postSkipSegments.ts
index 47ccff2..422ea88 100644
--- a/test/cases/postSkipSegments.ts
+++ b/test/cases/postSkipSegments.ts
@@ -1280,7 +1280,7 @@ describe("postSkipSegments", () => {
     });
 
     it("Should return 400 if videoID is empty", (done) => {
-        const videoID = null as string;
+        const videoID = null as unknown as string;
         postSkipSegmentParam({
             videoID,
             startTime: 1,