diff --git a/includes/CachedList.php b/includes/CachedList.php
index 2fcafce44..6afc24895 100644
--- a/includes/CachedList.php
+++ b/includes/CachedList.php
@@ -57,7 +57,7 @@ class CachedList implements ContainmentList {
 				if ( !is_array( $result ) ) {
 					throw new UnexpectedValueException( sprintf(
 						"Expected array but received '%s' from '%s::getValues'",
-						is_object( $result ) ? get_class( $result ) : gettype( $result ),
+						get_debug_type( $result ),
 						get_class( $this->nestedList )
 					) );
 				}
diff --git a/includes/Controller/NotificationController.php b/includes/Controller/NotificationController.php
index e7acf44fc..c44e24089 100644
--- a/includes/Controller/NotificationController.php
+++ b/includes/Controller/NotificationController.php
@@ -519,7 +519,7 @@ class NotificationController {
 		$notify->addFilter( static function ( $user ) use ( &$seen, $fname ) {
 			if ( !$user instanceof User ) {
 				wfDebugLog( $fname, 'Expected all User instances, received: ' .
-					( is_object( $user ) ? get_class( $user ) : gettype( $user ) )
+					get_debug_type( $user )
 				);
 
 				return false;
diff --git a/includes/Iterator/FilteredSequentialIterator.php b/includes/Iterator/FilteredSequentialIterator.php
index 567fd2f07..71c4d5404 100644
--- a/includes/Iterator/FilteredSequentialIterator.php
+++ b/includes/Iterator/FilteredSequentialIterator.php
@@ -64,8 +64,8 @@ class FilteredSequentialIterator implements IteratorAggregate {
 		} elseif ( $users instanceof IteratorAggregate ) {
 			$it = $users->getIterator();
 		} else {
-			throw new InvalidArgumentException( 'Expected array, Iterator or IteratorAggregate but received:' .
-				( is_object( $users ) ? get_class( $users ) : gettype( $users ) )
+			throw new InvalidArgumentException( 'Expected array, Iterator or IteratorAggregate but received ' .
+				get_debug_type( $users )
 			);
 		}