diff --git a/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/ClassPersistInstances.java b/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/ClassPersistInstances.java
index 0422b6e0c38..bc652b99df4 100644
--- a/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/ClassPersistInstances.java
+++ b/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/ClassPersistInstances.java
@@ -52,8 +52,8 @@ final class ClassPersistInstances {
     NessiePersistCache nessiePersistCache =
         PersistExtension.annotationInstance(context, NessiePersistCache.class);
     cacheBackend =
-        nessiePersistCache != null
-            ? PersistCaches.newBackend(nessiePersistCache.capacity(), null)
+        nessiePersistCache != null && nessiePersistCache.capacityMb() >= 0
+            ? PersistCaches.newBackend(nessiePersistCache.capacityMb(), null)
             : null;
 
     backendTestFactory = reusableTestBackend.backendTestFactory(context);
diff --git a/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/NessiePersistCache.java b/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/NessiePersistCache.java
index d95a0de7484..49ca29afbe0 100644
--- a/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/NessiePersistCache.java
+++ b/versioned/storage/testextension/src/main/java/org/projectnessie/versioned/storage/testextension/NessiePersistCache.java
@@ -23,12 +23,14 @@
 
 /**
  * Adds a cache in front of the created {@link
- * org.projectnessie.versioned.storage.common.persist.Persist} instances, if the {@link #capacity()}
- * is {@code >= 0}.
+ * org.projectnessie.versioned.storage.common.persist.Persist} instances, if the {@link
+ * #capacityMb()} is {@code >= 0}.
  */
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 @Inherited
 public @interface NessiePersistCache {
-  long capacity() default 1024 * 1024;
+
+  /** The maximum capacity of the cache in MB. Default is 1 MB. */
+  long capacityMb() default 1;
 }