diff --git a/app/src/messages.py b/app/src/messages.py
index 493b016..64af37f 100644
--- a/app/src/messages.py
+++ b/app/src/messages.py
@@ -318,6 +318,8 @@ class Message(metaclass=IterRegistry):
                                             self.header_len)
                 logger.debug(f'tsun-time: {result[0]:08x}'
                              f'  proxy-time: {ts:08x}')
+            elif not self.ctrl.is_ind():
+                self.inc_counter('Unknown_Ctrl')
         else:
             if self.ctrl.is_ind():
                 ts = self.__timestamp()
diff --git a/app/tests/test_messages.py b/app/tests/test_messages.py
index 30bdd3a..79ebb42 100644
--- a/app/tests/test_messages.py
+++ b/app/tests/test_messages.py
@@ -342,8 +342,8 @@ def test_msg_get_time(ConfigTsunInv1, MsgGetTime):
     assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
     m.close()
 
-def test_msg_time_resp(ConfigTsunInv1, MsgTimeResp):
-    ConfigTsunInv1
+def test_msg_time_resp(ConfigNoTsunInv1, MsgTimeResp):
+    ConfigNoTsunInv1
     m = MemoryStream(MsgTimeResp, (0,), False)
     m.db.stat['proxy']['Unknown_Ctrl'] = 0
     m.read()         # read complete msg, and dispatch msg