diff --git a/erpnext/manufacturing/doctype/job_card/job_card.py b/erpnext/manufacturing/doctype/job_card/job_card.py
index 9e3d5c37992e..2ca7e5821aa4 100644
--- a/erpnext/manufacturing/doctype/job_card/job_card.py
+++ b/erpnext/manufacturing/doctype/job_card/job_card.py
@@ -215,7 +215,7 @@ def get_overlap_for(self, args, check_next_available_slot=False):
 			sequentialjc_list = [[]]
 			temp = existing.copy()
 			while len(temp) > 0:
-				[seqtemp,temp1] = groupingjc(temp)
+				[seqtemp,temp1] = self.groupingjc(temp)
 				sequentialjc_list.append(seqtemp)
 				temp = temp1
 			sequentialjc_list.pop(0)