diff --git a/gns3server/schemas/dynamips_vm.py b/gns3server/schemas/dynamips_vm.py
index 1ec43c62..c5225c21 100644
--- a/gns3server/schemas/dynamips_vm.py
+++ b/gns3server/schemas/dynamips_vm.py
@@ -65,7 +65,6 @@ VM_CREATE_SCHEMA = {
         "startup_config": {
             "description": "Path to the IOS startup configuration file",
             "type": "string",
-            "minLength": 1,
         },
         "startup_config_content": {
             "description": "Content of IOS startup configuration file",