diff --git a/lms/djangoapps/mobile_api/users/serializers.py b/lms/djangoapps/mobile_api/users/serializers.py
index 5f5976c993d3..9b36fcc119f4 100644
--- a/lms/djangoapps/mobile_api/users/serializers.py
+++ b/lms/djangoapps/mobile_api/users/serializers.py
@@ -105,8 +105,6 @@ class CourseEnrollmentSerializer(serializers.ModelSerializer):
     audit_access_expires = serializers.SerializerMethodField()
     course_modes = serializers.SerializerMethodField()
 
-    # BLOCK_STRUCTURE_CACHE_TIMEOUT = 60 * 60  # 1 hour
-
     def get_audit_access_expires(self, model):
         """
         Returns expiration date for a course audit expiration, if any or null