diff --git a/tests/unit/test_link_quality.cpp b/tests/unit/test_link_quality.cpp
index 2c9d92b92..405a0c577 100644
--- a/tests/unit/test_link_quality.cpp
+++ b/tests/unit/test_link_quality.cpp
@@ -108,6 +108,7 @@ void TestLinkQualityData(RssTestData aRssData)
         min = MIN_RSS(rss, min);
         max = MAX_RSS(rss, max);
         linkInfo.AddRss(sNoiseFloor, rss);
+        VerifyOrQuit(linkInfo.GetLastRss() == rss, "TestLinkQualityInfo failed - GetLastRss() is incorrect");
         ave = linkInfo.GetAverageRss();
         VerifyOrQuit(ave >= min, "TestLinkQualityInfo failed - GetAverageRss() is smaller than min value.");
         VerifyOrQuit(ave <= max, "TestLinkQualityInfo failed - GetAverageRss() is larger than min value");