diff --git a/libraries/classes/Database/Designer/Common.php b/libraries/classes/Database/Designer/Common.php
index e77d92f96a..fdc5941b06 100644
--- a/libraries/classes/Database/Designer/Common.php
+++ b/libraries/classes/Database/Designer/Common.php
@@ -776,7 +776,7 @@ class Common
         // internal relations
         $delete_query = 'DELETE FROM '
             . Util::backquote($GLOBALS['cfgRelation']['db']) . '.'
-            . $GLOBALS['cfgRelation']['relation'] . ' WHERE '
+            . Util::backquote($GLOBALS['cfgRelation']['relation']) . ' WHERE '
             . "master_db = '" . $this->dbi->escapeString($DB2) . "'"
             . " AND master_table = '" . $this->dbi->escapeString($T2) . "'"
             . " AND master_field = '" . $this->dbi->escapeString($F2) . "'"