diff --git a/introspection/org.freedesktop.ModemManager.Modem.xml b/introspection/org.freedesktop.ModemManager.Modem.xml
index a65759d5..1a82b2d5 100644
--- a/introspection/org.freedesktop.ModemManager.Modem.xml
+++ b/introspection/org.freedesktop.ModemManager.Modem.xml
@@ -279,7 +279,7 @@
     </tp:enum>
 
     <tp:enum name="MM_MODEM_STATE_CHANGED_REASON" type="u">
-      <tp:enumvalue suffix="UNKNOWN" value="0">
+      <tp:enumvalue suffix="NONE" value="0">
         <tp:docstring>
           Reason unknown or not reportable.
         </tp:docstring>