diff --git a/owrx/fax.py b/owrx/fax.py
index 8190770d..3fdb41a6 100644
--- a/owrx/fax.py
+++ b/owrx/fax.py
@@ -162,7 +162,7 @@ class FaxParser(ThreadModule):
                             msg
                         ))
                         # If not running as a service, compose result
-                        if not service:
+                        if not self.service:
                             out = {
                                 "mode":      "Fax",
                                 "message":   msg,