diff --git a/java/java-tests/testSrc/com/intellij/java/index/IndexTest.groovy b/java/java-tests/testSrc/com/intellij/java/index/IndexTest.groovy
index cf1fe3301a1b..7bf42bef9de0 100644
--- a/java/java-tests/testSrc/com/intellij/java/index/IndexTest.groovy
+++ b/java/java-tests/testSrc/com/intellij/java/index/IndexTest.groovy
@@ -58,6 +58,7 @@ import com.intellij.util.*
 import com.intellij.util.indexing.*
 import com.intellij.util.indexing.impl.MapIndexStorage
 import com.intellij.util.indexing.impl.MapReduceIndex
+import com.intellij.util.indexing.impl.UpdatableValueContainer
 import com.intellij.util.io.*
 import com.intellij.util.ref.GCUtil
 import com.siyeh.ig.JavaOverridingMethodUtil
@@ -922,7 +923,7 @@ class IndexTest extends JavaCodeInsightFixtureTestCase {
 
     try {
       MapIndexStorage<String, String> storage = assertInstanceOf(index, MapReduceIndex.class).getStorage()
-      def map = storage.getIndexMap()
+      PersistentHashMap<String, UpdatableValueContainer<String>> map = storage.getIndexMap()
       assertTrue(map.getReadOnly())
       assertTrue(map.getValueStorage().isReadOnly())
     } finally {
diff --git a/platform/util/src/com/intellij/util/io/PersistentHashMap.java b/platform/util/src/com/intellij/util/io/PersistentHashMap.java
index 5eb4f19a4f66..2f86d4aead36 100644
--- a/platform/util/src/com/intellij/util/io/PersistentHashMap.java
+++ b/platform/util/src/com/intellij/util/io/PersistentHashMap.java
@@ -1007,4 +1007,9 @@ public class PersistentHashMap<Key, Value> extends PersistentEnumeratorDelegate<
   PersistentHashMapValueStorage getValueStorage() {
     return myValueStorage;
   }
+
+  @TestOnly
+  public boolean getReadOnly() {
+    return myIsReadOnly;
+  }
 }