diff --git a/src/vue-ladda.vue b/src/vue-ladda.vue
index 9550cd4..0e6967c 100644
--- a/src/vue-ladda.vue
+++ b/src/vue-ladda.vue
@@ -13,7 +13,7 @@
     props: {
       // customizable button's class attribute - you can use your own CSS class
       'buttonClass': {
-        type: String,
+        type: [String, Object],
         default: 'ladda-button'
       },
       // use vue props validation to make sure "data-style" is given. (ladda need it)
@@ -65,4 +65,4 @@
 <style lang="scss">
   // TODO: make themed a option?
   @import '~ladda/css/ladda-themed.scss';
-</style>
\ No newline at end of file
+</style>