diff --git a/purchase.py b/purchase.py
index b33405fc7d..01cf67fc45 100644
--- a/purchase.py
+++ b/purchase.py
@@ -77,6 +77,8 @@ class Purchase:
                     and all(l.invoice for l in invoice_lines)
                     and all(l.invoice.state == 'paid' for l in invoice_lines)):
                 return 'paid'
+            else:
+                return 'waiting'
         return state
 
     @classmethod