diff --git a/frappe/desk/reportview.py b/frappe/desk/reportview.py
index fa4992c9f4..145130dae7 100644
--- a/frappe/desk/reportview.py
+++ b/frappe/desk/reportview.py
@@ -188,7 +188,7 @@ def is_standard(fieldname):
 	return fieldname in default_fields or fieldname in optional_fields or fieldname in child_table_fields
 
 
-@lru_cache
+@lru_cache(maxsize=1024)
 def extract_fieldnames(field):
 	from frappe.database.schema import SPECIAL_CHAR_PATTERN