diff --git a/mod/subsection/db/install.xml b/mod/subsection/db/install.xml
index a452b5315cf..6d5fcfc7c50 100644
--- a/mod/subsection/db/install.xml
+++ b/mod/subsection/db/install.xml
@@ -15,9 +15,6 @@
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
         <KEY NAME="fk_course" TYPE="foreign" FIELDS="course" REFTABLE="course" REFFIELDS="id"/>
       </KEYS>
-      <INDEXES>
-        <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
-      </INDEXES>
     </TABLE>
   </TABLES>
 </XMLDB>