diff --git a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
index 7593b69e9..b1ae1c458 100644
--- a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
+++ b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
@@ -15,7 +15,7 @@ from .agent_sub_configurations import (
 )
 from .utils import freeze_lists
 
-valid_custom_pba_filename_regex = re.compile(r"^([a-zA-Z0-9\ \._-]+)$")
+valid_custom_pba_filename_regex = re.compile(r"^([a-zA-Z0-9\ \._-]*)$")
 
 
 class CustomPBAConfigurationSchema(Schema):