diff --git a/swiftnav_console/observation_tab.py b/swiftnav_console/observation_tab.py
index e94be76b9..d971d29f1 100644
--- a/swiftnav_console/observation_tab.py
+++ b/swiftnav_console/observation_tab.py
@@ -245,7 +245,8 @@ def padFloat(self, num, length, digits=2, allowNegative=True):  # pylint: disabl
     gal_codes = Property(QTKeys.QVARIANTLIST, get_gal_codes, notify=codes_changed)  # type: ignore
     qzs_codes = Property(QTKeys.QVARIANTLIST, get_qzs_codes, notify=codes_changed)  # type: ignore
     sbas_codes = Property(QTKeys.QVARIANTLIST, get_sbas_codes, notify=codes_changed)  # type: ignore
-    codes = Property(QTKeys.QVARIANTLIST, get_codes, notify=codes_changed)  # type: ignore
+    # Confusingly, codes depends on self._rows not self._codes
+    codes = Property(QTKeys.QVARIANTLIST, get_codes, notify=row_count_changed)  # type: ignore
 
 
 def obs_rows_to_json(rows):