diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
index 12f2fe1..fb0bf99 100755
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
@@ -166,7 +166,7 @@
 	sales_invoice.patient = appointment_doc.patient
 	sales_invoice.customer = frappe.get_value('Patient', appointment_doc.patient, 'customer')
 	sales_invoice.currency = frappe.get_value('Customer', sales_invoice.customer, 'default_currency') \
-		or get_company_currency(appointment_doc.currency)
+		or get_company_currency(appointment_doc.company)
 	sales_invoice.appointment = appointment_doc.name
 	sales_invoice.due_date = getdate()
 	sales_invoice.company = appointment_doc.company