diff --git a/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java b/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
index 87ff29d5e6a..b4c69600fbd 100644
--- a/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
+++ b/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
@@ -308,7 +308,7 @@ public void testRamBytesSync() throws IOException {
 
     cache.put(0, "test");
     long nonEmptySize = cache.ramBytesUsed();
-    cache.put(0, "test");
+    cache.put(0, random().nextBoolean() ? "test" : "rest");
     assertEquals(nonEmptySize, cache.ramBytesUsed());
 
     cache.remove(0);
@@ -341,7 +341,7 @@ public void testRamBytesAsync() throws IOException {
 
     cache.put(0, "test");
     long nonEmptySize = cache.ramBytesUsed();
-    cache.put(0, "test");
+    cache.put(0, random().nextBoolean() ? "test" : "rest");
     assertEquals(nonEmptySize, cache.ramBytesUsed());
 
     cache.remove(0);