diff --git a/docs/en/documentation/realtime/gtfs-realtime.proto b/docs/en/documentation/realtime/gtfs-realtime.proto
index 17bbf6edb..e7cfe8885 100644
--- a/docs/en/documentation/realtime/gtfs-realtime.proto
+++ b/docs/en/documentation/realtime/gtfs-realtime.proto
@@ -625,7 +625,6 @@ message Alert {
   // Time when the alert should be shown to the user. If missing, the
   // alert will be shown as long as it appears in the feed.
   // If multiple ranges are given, the alert will be shown during all of them.
-  repeated TimeRange active_period = 1;
   // Should not be used - for backwards-compatibility only.
   repeated TimeRange active_period = 1 [deprecated = true];
 
@@ -1268,4 +1267,4 @@ message ReplacementStop {
 
   // The following extension IDs are reserved for private use by any organization.
   extensions 9000 to 9999;
-}
\ No newline at end of file
+}