diff --git a/lib/tests/messageinbound_test.php b/lib/tests/messageinbound_test.php
index 52bb2a60133fa..e2fcd977fdf4a 100644
--- a/lib/tests/messageinbound_test.php
+++ b/lib/tests/messageinbound_test.php
@@ -103,7 +103,7 @@ public function message_inbound_handler_trim_testprovider() {
 
     protected function read_test_file(\SplFileInfo $file, $fixturesdir) {
         // Break on the --[TOKEN]-- tags in the file.
-        $tokens = preg_split('#(?:^|\n*)----([A-Z-]+)----\n#', file_get_contents($file->getRealPath()),
+        $tokens = preg_split('#(?:^|\n*)----([A-Z]+)----\n#', file_get_contents($file->getRealPath()),
                 null, PREG_SPLIT_DELIM_CAPTURE);
         $sections = array(
             // Key              => Required.