diff --git a/erpnext/manufacturing/doctype/blanket_order/blanket_order.py b/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
index 03f4179f37b..9748bb11bb2 100644
--- a/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
+++ b/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
@@ -120,8 +120,8 @@ class BlanketOrder(Document):
 
 	def validate_item_qty(self):
 		for d in self.items:
-			if flt(d.qty) < 0:
-				frappe.throw(_("Row {0}: Quantity cannot be negative.").format(d.idx))
+			if flt(d.qty) <= 0:
+				frappe.throw(_("Row {0}: Quantity must be greater than zero.").format(d.idx))
 
 
 @frappe.whitelist()