diff --git a/prometheuspvesd/cli.py b/prometheuspvesd/cli.py
index 6e21b1d..30a22d7 100644
--- a/prometheuspvesd/cli.py
+++ b/prometheuspvesd/cli.py
@@ -121,12 +121,12 @@ class PrometheusSD:
 
         if config.config["pve"]["token_name"] and not config.config["pve"]["token_value"]:
             self.log.sysexit_with_message(
-                f"Option 'pve.token_name' require 'pve.token_value' to be set"
+                "Option 'pve.token_name' require 'pve.token_value' to be set"
             )
 
         if not config.config["pve"]["token_name"] and not config.config["pve"]["password"]:
             self.log.sysexit_with_message(
-                f"Neither password nor API token have been set for pve authentication"
+                "Neither password nor API token have been set for pve authentication"
             )
 
         self.logger.info(f"Using config file {config.config_file}")