diff --git a/lucene/core/src/java/module-info.java b/lucene/core/src/java/module-info.java
index f56b19409a2..02fc3ff0821 100644
--- a/lucene/core/src/java/module-info.java
+++ b/lucene/core/src/java/module-info.java
@@ -52,6 +52,9 @@ module org.apache.lucene.core {
   // Only export internal packages to the test framework.
   exports org.apache.lucene.internal.tests to
       org.apache.lucene.test_framework;
+  // Open certain packages for the test framework (ram usage tester).
+  opens org.apache.lucene.document to
+      org.apache.lucene.test_framework;
 
   provides org.apache.lucene.analysis.TokenizerFactory with
       org.apache.lucene.analysis.standard.StandardTokenizerFactory;
diff --git a/lucene/test-framework/src/java/module-info.java b/lucene/test-framework/src/java/module-info.java
index d87d56a6938..893d57189bb 100644
--- a/lucene/test-framework/src/java/module-info.java
+++ b/lucene/test-framework/src/java/module-info.java
@@ -23,6 +23,10 @@ module org.apache.lucene.test_framework {
   requires transitive junit;
   requires transitive randomizedtesting.runner;
 
+  // Open certain packages for junit because it scans methods via reflection.
+  opens org.apache.lucene.tests.index to
+      junit;
+
   exports org.apache.lucene.tests.analysis.standard;
   exports org.apache.lucene.tests.analysis;
   exports org.apache.lucene.tests.codecs.asserting;