diff --git a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
index e3f2fe16a..50593da83 100644
--- a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
+++ b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
@@ -15,8 +15,8 @@ from .agent_sub_configurations import (
 )
 from .utils import freeze_lists
 
-valid_windows_custom_pba_filename_regex = re.compile(r"^[^<>:\"\\\/|?*]+[^<>:\"\\\/|?* \.]$")
-valid_linux_custom_pba_filename_regex = re.compile(r"^[^\\]+$")
+valid_windows_custom_pba_filename_regex = re.compile(r"^[^<>:\"\\\/|?*]+[^<>:\"\\\/|?* \.]$|^$")
+valid_linux_custom_pba_filename_regex = re.compile(r"^[^\\]+$|^$")
 
 
 class CustomPBAConfigurationSchema(Schema):