diff --git a/src/Database/Traits/Multisite.php b/src/Database/Traits/Multisite.php
index b777618b5..5d98ce907 100644
--- a/src/Database/Traits/Multisite.php
+++ b/src/Database/Traits/Multisite.php
@@ -174,7 +174,7 @@ public function canDeleteMultisiteRelation($name, $type = null): bool
             $type = $this->getRelationType($name);
         }
 
-        if (!in_array($type, ['belongsToMany', 'belongsTo', 'hasOne', 'hasMany', 'attachOne', 'attachMany'])) {
+        if (!in_array($type, ['belongsToMany', 'morphedByMany', 'belongsTo', 'hasOne', 'hasMany', 'attachOne', 'attachMany'])) {
             return false;
         }
 
@@ -185,7 +185,7 @@ public function canDeleteMultisiteRelation($name, $type = null): bool
     /**
      * defineMultisiteRelation will modify defined relations on this model so they share
      * their association using the shared identifier (`site_root_id`). Only these relation
-     * types support relation sharing: `belongsToMany`, `morphedByMany`, `morphToMany`,
+     * types support relation sharing: `belongsToMany`, `morphedByMany`,
      * `belongsTo`, `hasOne`, `hasMany`, `attachOne`, `attachMany`.
      */
     protected function defineMultisiteRelation($name, $type = null)
@@ -203,9 +203,6 @@ protected function defineMultisiteRelation($name, $type = null)
             if (in_array($type, ['belongsToMany', 'morphedByMany'])) {
                 $this->$type[$name]['parentKey'] = 'site_root_id';
             }
-            elseif (in_array($type, ['morphToMany'])) {
-                $this->$type[$name]['relatedKey'] = 'site_root_id';
-            }
             elseif (in_array($type, ['belongsTo', 'hasOne', 'hasMany'])) {
                 $this->$type[$name]['otherKey'] = 'site_root_id';
             }