diff --git a/erpnext/healthcare/doctype/lab_test/test_lab_test.py b/erpnext/healthcare/doctype/lab_test/test_lab_test.py
index c9f0029..c3847ea 100644
--- a/erpnext/healthcare/doctype/lab_test/test_lab_test.py
+++ b/erpnext/healthcare/doctype/lab_test/test_lab_test.py
@@ -147,6 +147,7 @@
 	sales_invoice.customer = frappe.db.get_value('Patient', patient, 'customer')
 	sales_invoice.due_date = getdate()
 	sales_invoice.company = '_Test Company'
+	sales_invoice.currency = 'INR'
 	sales_invoice.debit_to = get_receivable_account('_Test Company')
 
 	tests = [insulin_resistance_template, blood_test_template]