diff --git a/src/ORM/ListDecorator.php b/src/ORM/ListDecorator.php
index b350b994faa..9f3640e89f9 100644
--- a/src/ORM/ListDecorator.php
+++ b/src/ORM/ListDecorator.php
@@ -133,12 +133,19 @@ public function last()
         return $this->list->last();
     }
 
+    public function getTotalItems()
+    {
+        return $this->list->count();
+    }
+
     /**
      * @return int
+     * @depreated 5.4.0 Use getTotalItems() instead.
      */
     public function TotalItems()
     {
-        return $this->list->count();
+        Deprecation::notice('5.4.0', 'Use getTotalItems() instead.');
+        return $this->getTotalItems();
     }
 
     public function Count(): int
diff --git a/src/ORM/PaginatedList.php b/src/ORM/PaginatedList.php
index e9b7546c6ad..554c1cb9b91 100644
--- a/src/ORM/PaginatedList.php
+++ b/src/ORM/PaginatedList.php
@@ -540,9 +540,11 @@ public function PrevLink()
 
     /**
      * Returns the total number of items in the list
+     * @depreated 5.4.0 Use getTotalItems() instead.
      */
     public function TotalItems()
     {
+        Deprecation::notice('5.4.0', 'Use getTotalItems() instead.');
         return $this->getTotalItems();
     }
 
diff --git a/tests/php/ORM/GroupedListTest.php b/tests/php/ORM/GroupedListTest.php
index 8b3ea9689af..51f214cc0b5 100644
--- a/tests/php/ORM/GroupedListTest.php
+++ b/tests/php/ORM/GroupedListTest.php
@@ -193,6 +193,6 @@ public function testTotalItems()
             )
         );
 
-        $this->assertEquals(4, $list->TotalItems());
+        $this->assertEquals(4, $list->getTotalItems());
     }
 }
diff --git a/tests/php/ORM/ListDecoratorTest.php b/tests/php/ORM/ListDecoratorTest.php
index e0c011a9009..cc67e3e6d58 100644
--- a/tests/php/ORM/ListDecoratorTest.php
+++ b/tests/php/ORM/ListDecoratorTest.php
@@ -251,7 +251,7 @@ public function testLimit()
     public function testTotalItems()
     {
         $this->list->expects($this->once())->method('count')->willReturn(5);
-        $this->assertSame(5, $this->decorator->TotalItems());
+        $this->assertSame(5, $this->decorator->getTotalItems());
     }
 
     public function testAdd()