diff --git a/stack_orchestrator/deploy/webapp/request_webapp_deployment.py b/stack_orchestrator/deploy/webapp/request_webapp_deployment.py
index 85ec4520..70884f9d 100644
--- a/stack_orchestrator/deploy/webapp/request_webapp_deployment.py
+++ b/stack_orchestrator/deploy/webapp/request_webapp_deployment.py
@@ -89,7 +89,7 @@ def command(
             fatal(f"Unable to locate deployer: {deployer}")
 
         if env_file and config_ref:
-            fatal(f"Cannot use --env-file and --config-ref at the same time.")
+            fatal("Cannot use --env-file and --config-ref at the same time.")
 
         # If env_file
         if env_file: