diff --git a/sysmocom/suites/ussd/assert_extension.py b/sysmocom/suites/ussd/assert_extension.py
index bac311f..87f2ee5 100755
--- a/sysmocom/suites/ussd/assert_extension.py
+++ b/sysmocom/suites/ussd/assert_extension.py
@@ -31,7 +31,7 @@
 ms.log_info()
 
 print('waiting for modems to attach...')
-wait(ms.is_connected, msc.mcc_mnc())
+wait(ms.is_registered, msc.mcc_mnc())
 wait(msc.subscriber_attached, ms)
 
 # ofono (qmi) currently changes state to 'registered' jut after sending