diff --git a/frappe/permissions.py b/frappe/permissions.py
index 7fb189064d..5cc853b4b2 100644
--- a/frappe/permissions.py
+++ b/frappe/permissions.py
@@ -388,7 +388,7 @@ def has_user_permission(doc, user=None, debug=False):
 			# get the list of all allowed values for this link
 			allowed_docs = get_allowed_docs_for_doctype(user_permissions.get(field.options, []), doctype)
 
-			if allowed_docs and d.get(field.fieldname) not in allowed_docs:
+			if allowed_docs and str(d.get(field.fieldname)) not in allowed_docs:
 				# restricted for this link field, and no matching values found
 				# make the right message and exit
 				if d.get("parentfield"):