diff --git a/build/gen_stub.php b/build/gen_stub.php
index ead9b83cc77..9094fb0d230 100755
--- a/build/gen_stub.php
+++ b/build/gen_stub.php
@@ -3284,7 +3284,7 @@ if ($replaceMethodSynopses && $targetSynopses === null) {
 }
 
 if (isset($options["h"]) || isset($options["help"])) {
-    die("\nusage: gen-stub.php [ -f | --force-regeneration ] [ --generate-classsynopses ] [ --replace-classsynopses ] [ --generate-methodsynopses ] [ --replace-methodsynopses ] [ --parameter-stats ] [ --verify ] [ -h | --help ] [ name.stub.php | directory ] [ directory ]\n\n");
+    die("\nusage: gen_stub.php [ -f | --force-regeneration ] [ --generate-classsynopses ] [ --replace-classsynopses ] [ --generate-methodsynopses ] [ --replace-methodsynopses ] [ --parameter-stats ] [ --verify ] [ -h | --help ] [ name.stub.php | directory ] [ directory ]\n\n");
 }
 
 $fileInfos = [];