diff --git a/misc/devel/tidy.pl b/misc/devel/tidy.pl
index 5809f7aebc..01f6799124 100755
--- a/misc/devel/tidy.pl
+++ b/misc/devel/tidy.pl
@@ -138,6 +138,8 @@ sub tidy_tt {
             run( command => sprintf q{yarn --silent run prettier --write %s}, $file );
         if ($success) {
 
+            while ( !-f $file ) { sleep 1; }
+
             # Revert the substitutions done by the prettier plugin
             edit_file sub {
                 s#<!--</head>-->#</head>#g;