diff --git a/openedx/core/djangoapps/bookmarks/tasks.py b/openedx/core/djangoapps/bookmarks/tasks.py
index 836335c1289c..d6629ddef6f2 100644
--- a/openedx/core/djangoapps/bookmarks/tasks.py
+++ b/openedx/core/djangoapps/bookmarks/tasks.py
@@ -119,7 +119,7 @@ def update_block_cache_if_needed(block_cache, block_data):
         paths = _paths_from_data(block_data['paths'])
         if block_cache.display_name != block_data['display_name'] or not paths_equal(block_cache.paths, paths):
             log.info('Updating XBlockCache with usage_key: %s', str(block_cache.usage_key))
-            block_cache.display_name = block_data['display_name']
+            block_cache.display_name = block_data['display_name'][:255]
             block_cache.paths = paths
             block_cache.save()
 
@@ -136,7 +136,7 @@ def update_block_cache_if_needed(block_cache, block_data):
             log.info('Creating XBlockCache with usage_key: %s', str(block_data['usage_key']))
             block_cache, created = XBlockCache.objects.get_or_create(usage_key=block_data['usage_key'], defaults={
                 'course_key': course_key,
-                'display_name': block_data['display_name'],
+                'display_name': block_data['display_name'][:255],
                 'paths': paths,
             })