diff --git a/admin/environment.xml b/admin/environment.xml
index 4c62b706236..2fd7533f84a 100644
--- a/admin/environment.xml
+++ b/admin/environment.xml
@@ -4634,6 +4634,11 @@
           <ON_ERROR message="quizattemptsupgradedmessage" />
         </FEEDBACK>
       </CUSTOM_CHECK>
+      <CUSTOM_CHECK file="lib/upgradelib.php" function="check_slasharguments" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="slashargumentswarning" />
+        </FEEDBACK>
+      </CUSTOM_CHECK>
       <CUSTOM_CHECK file="lib/upgradelib.php" function="check_database_tables_row_format" level="optional">
         <FEEDBACK>
           <ON_CHECK message="unsupporteddbtablerowformat" />