diff --git a/src/Commands/field/FieldCreateCommands.php b/src/Commands/field/FieldCreateCommands.php
index 7688e119f8..310199d281 100644
--- a/src/Commands/field/FieldCreateCommands.php
+++ b/src/Commands/field/FieldCreateCommands.php
@@ -259,7 +259,7 @@ protected function askExistingFieldName(): ?string
     {
         $entityType = $this->input->getArgument('entityType');
         $bundle = $this->input->getArgument('bundle');
-        $showMachineNames = $this->input->getOption('show-machine-names');
+        $showMachineNames = (bool) $this->input->getOption('show-machine-names');
         $choices = $this->getExistingFieldStorageOptions($entityType, $bundle, $showMachineNames);
 
         if (empty($choices)) {