diff --git a/build_scripts/comfy/comfy_proxy.py b/build_scripts/comfy/comfy_proxy.py
index ee4d36f5..930c18d3 100755
--- a/build_scripts/comfy/comfy_proxy.py
+++ b/build_scripts/comfy/comfy_proxy.py
@@ -1174,7 +1174,7 @@ if is_on_ec2:
                 return web.Response(status=200, content_type='application/json',
                                     body=json.dumps({"result": False, "message": f"{workflow_name} is not allowed"}))
 
-            if not re.match(r'^[A-Za-z][A-Za-z0-9_]*$', workflow_name):
+            if not re.match(r'^[A-Za-z][A-Za-z0-9]*$', workflow_name):
                 return web.Response(status=200, content_type='application/json',
                                     body=json.dumps({"result": False, "message": f"{workflow_name} is invalid name"}))
 
diff --git a/infrastructure/src/shared/schema.ts b/infrastructure/src/shared/schema.ts
index f468adad..1d754d37 100644
--- a/infrastructure/src/shared/schema.ts
+++ b/infrastructure/src/shared/schema.ts
@@ -591,7 +591,7 @@ export const SCHEMA_WORKFLOW_NAME: JsonSchema = {
   type: JsonSchemaType.STRING,
   minLength: 1,
   maxLength: 20,
-  pattern: '^[A-Za-z][A-Za-z0-9_]*$',
+  pattern: '^[A-Za-z][A-Za-z0-9]*$',
   description: 'Name of workflow',
 };