diff --git a/src/Services/TagService.php b/src/Services/TagService.php
index b96a7e0..91bf6e2 100644
--- a/src/Services/TagService.php
+++ b/src/Services/TagService.php
@@ -354,7 +354,7 @@ public function renameTags(string $oldName, string $newName, $class = null): int
 
         return $pivot
             ->where($relatedKeyName, $oldTag->getKey())
-            ->where($relatedMorphType, get_class($class))
+            ->where($relatedMorphType, $class->getMorphClass())
             ->update([
                 $relatedKeyName => $newTag->getKey(),
             ]);
diff --git a/tests/TagServiceTests.php b/tests/TagServiceTests.php
index 9dbdd30..50fa2cd 100644
--- a/tests/TagServiceTests.php
+++ b/tests/TagServiceTests.php
@@ -313,6 +313,32 @@ public function testRenamingTag(): void
         );
     }
 
+    /**
+     * Test renaming a tag with a custom morph class key.
+     */
+    public function testRenamingTagWithCustomMorphClass(): void
+    {
+        // Create a model with a custom morph class key
+        $morphModel = new class extends TestModel {
+            protected $attributes = [
+                'title' => 'testing morph model'
+            ];
+            public function getMorphClass()
+            {
+                return 'test-morph-model'; // can any custom key that is different from the class name
+            }
+        };
+        $morphModel->save();
+
+        $morphModel->tag('Apple');
+        $morphModel->tag('Banana');
+        $morphModel->tag('Cherry');
+
+        // Rename the tags the morphModel class should have exactly 1 update
+        $count = $this->service->renameTags('Apple', 'Apricot', $morphModel);
+        $this->assertEquals(1, $count);
+    }
+
     /**
      * Test renaming a tag across all models.
      */