diff --git a/src/core.clj b/src/core.clj
index 897d272..7742cb7 100644
--- a/src/core.clj
+++ b/src/core.clj
@@ -74,9 +74,9 @@
   "Run the CLI interface."
   [& args]
   (let [{:keys [options errors summary]} (parse-opts args cli-options)
-        errors (if-not (or (contains? options :csv) (contains? options :demo))
-                 (conj errors "Please provide a CSV file with \"--csv FILE\" or try \"--demo\"")
-                 errors)]
+        no-csv-or-demo? (not (or (contains? options :csv) (contains? options :demo)))
+        errors (cond-> errors
+                 no-csv-or-demo? (conj "Please provide a CSV file with \"--csv FILE\" or try \"--demo\""))]
     (when (:help options)
       (println summary)
       (System/exit 0))