diff --git a/tests/31sync/15lazy-members.pl b/tests/31sync/15lazy-members.pl
index bbcf7c50a..2234fc17c 100644
--- a/tests/31sync/15lazy-members.pl
+++ b/tests/31sync/15lazy-members.pl
@@ -597,13 +597,7 @@
       })->then( sub {
          matrix_join_room( $charlie, $room_id );
       })->then( sub {
-         repeat( sub {
-            my $msgnum = $_[0];
-
-            matrix_send_room_text_message( $bob, $room_id,
-               body => "Message $msgnum",
-            )
-         }, foreach => [ 1 .. 10 ])
+         matrix_send_filler_messages_synced( $bob, $room_id, 10 );
       })->then( sub {
          matrix_sync( $alice, filter => $filter_id );
       })->then( sub {
@@ -613,21 +607,9 @@
             $bob->user_id,
          ]);
 
-         repeat( sub {
-            my $msgnum = $_[0];
-
-            matrix_send_room_text_message( $bob, $room_id,
-               body => "Message $msgnum",
-            )
-         }, foreach => [ 1 .. 10 ])
+         matrix_send_filler_messages_synced( $bob, $room_id, 10 );
       })->then( sub {
-         repeat( sub {
-            my $msgnum = $_[0];
-
-            matrix_send_room_text_message( $charlie, $room_id,
-               body => "Message $msgnum",
-            )
-         }, foreach => [ 1 .. 10 ])
+         matrix_send_filler_messages_synced( $charlie, $room_id, 10 );
       })->then( sub {
          matrix_sync_again( $alice, filter => $filter_id );
       })->then( sub {