diff --git a/src/Utils/FederatedSchemaPrinter.php b/src/Utils/FederatedSchemaPrinter.php
index 8eab202..06b098b 100644
--- a/src/Utils/FederatedSchemaPrinter.php
+++ b/src/Utils/FederatedSchemaPrinter.php
@@ -254,7 +254,7 @@ private static function printArgs($options, $args, $indentation = ''): string
                 return empty($arg->description);
             })
         ) {
-            return '(' . implode(', ', array_map('self::printInputValue', $args)) . ')';
+            return '(' . implode(', ', array_map('FederatedSchemaPrinter::printInputValue', $args)) . ')';
         }
 
         return sprintf(