diff --git a/src/class_names/core.cljs b/src/class_names/core.cljs
index 5a032f1..d8631a1 100644
--- a/src/class_names/core.cljs
+++ b/src/class_names/core.cljs
@@ -1,5 +1,11 @@
 (ns class-names.core)
 
+(defn class-names-map [map]
+  (reduce (fn [map-arr [key value]]
+    (if (true? value)
+      (conj map-arr key)
+      map-arr)) [] map))
+
 (defn class-names [& args]
   (clojure.string/join " "
     (mapv name
@@ -9,9 +15,5 @@
               (symbol? arg)
               (keyword? arg)) (conj arr arg)
           (vector? arg) (vec (concat arr arg))
-          (map? arg) (vec (concat arr
-                            (reduce-kv (fn [map-arr key value]
-                              (if (true? value)
-                                (conj map-arr key)
-                                map-arr)) [] arg)))
+          (map? arg) (vec (concat arr (class-names-map arg)))
           :else arr)) [] args))))