diff --git a/cli/server.go b/cli/server.go
index 446bfcd8..a4f0ae8d 100644
--- a/cli/server.go
+++ b/cli/server.go
@@ -224,7 +224,7 @@ later for more advanced use cases.
 		}
 
 		if string(ipv4) == "" {
-			return fmt.Errorf("Unable to retrieve ipv4 address for %s", host)
+			return fmt.Errorf("unable to retrieve ipv4 address for %s", host)
 		}
 
 		ctx := context.Background()