diff --git a/config_generator/config_generator.py b/config_generator/config_generator.py
index 7d599b9c..2693f834 100644
--- a/config_generator/config_generator.py
+++ b/config_generator/config_generator.py
@@ -2,7 +2,7 @@ import os
 from jinja2 import Environment, FileSystemLoader
 
 ENVOY_CONFIG_TEMPLATE_FILE = os.getenv('ENVOY_CONFIG_TEMPLATE_FILE', 'envoy.template.yaml')
-BOLT_CONFIG_FILE = os.getenv('BOLT_CONFIG_FILE', 'bolt-config.yaml')
+BOLT_CONFIG_FILE = os.getenv('BOLT_CONFIG_FILE', 'bolt_config.yaml')
 ENVOY_CONFIG_FILE_RENDERED = os.getenv('ENVOY_CONFIG_FILE_RENDERED', '/usr/src/app/out/envoy.yaml')
 
 env = Environment(loader=FileSystemLoader('./'))
diff --git a/demos/function_calling/bolt-config.yaml b/demos/function_calling/bolt_config.yaml
similarity index 100%
rename from demos/function_calling/bolt-config.yaml
rename to demos/function_calling/bolt_config.yaml
diff --git a/demos/function_calling/docker-compose.yaml b/demos/function_calling/docker-compose.yaml
index 2b1e22e9..09fe9b4b 100644
--- a/demos/function_calling/docker-compose.yaml
+++ b/demos/function_calling/docker-compose.yaml
@@ -7,7 +7,7 @@ services:
       dockerfile: config_generator/Dockerfile
     volumes:
       - ../../envoyfilter/envoy.template.yaml:/usr/src/app/envoy.template.yaml
-      - ./bolt-config.yaml:/usr/src/app/bolt-config.yaml
+      - ./bolt_config.yaml:/usr/src/app/bolt_config.yaml
       - ./generated:/usr/src/app/out
 
   bolt: