diff --git a/composer.json b/composer.json
index f3991162..4c225283 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
     "prepare": "wget -O build/translations.json http://api.wordpress.org/translations/core/1.0/",
     "flags-png": "php bin/flags-png.php > flags/flags.php",
     "flags-svg": "php bin/flags-svg.php > css/flags.php",
-    "diagram:class": "vendor/bin/php-class-diagram --php7 includes > diagrams/mslsl-class.puml",
+    "diagram:class": "vendor/bin/php-class-diagram --php7 includes > diagrams/msls-class.puml",
     "diagram:package": "vendor/bin/php-class-diagram --package-diagram --php7 includes > diagrams/msls-package.puml",
     "githooks": [
       "if [ -e ./githooks/pre-commit ]; then cp ./githooks/pre-commit ./.git/hooks/; fi",
diff --git a/diagrams/mslsl-class.puml b/diagrams/msls-class.puml
similarity index 100%
rename from diagrams/mslsl-class.puml
rename to diagrams/msls-class.puml