diff --git a/lucene/core/src/test/org/apache/lucene/search/TestLRUQueryCache.java b/lucene/core/src/test/org/apache/lucene/search/TestLRUQueryCache.java
index 43c8f27cf6f..a1053f07ced 100644
--- a/lucene/core/src/test/org/apache/lucene/search/TestLRUQueryCache.java
+++ b/lucene/core/src/test/org/apache/lucene/search/TestLRUQueryCache.java
@@ -381,6 +381,8 @@ public class TestLRUQueryCache extends LuceneTestCase {
   // by the cache itself, not cache entries, and we want to make sure that
   // memory usage is not grossly underestimated.
   public void testRamBytesUsedConstantEntryOverhead() throws IOException {
+    assumeFalse("LUCENE-7595: RamUsageTester does not work exact in Java 9 (estimations for maps and lists)", Constants.JRE_IS_MINIMUM_JAVA9);
+    
     final LRUQueryCache queryCache = new LRUQueryCache(1000000, 10000000, context -> true);
 
     final RamUsageTester.Accumulator acc = new RamUsageTester.Accumulator() {