diff --git a/src/main.js b/src/main.js
index e9fb8f5..5da5ca0 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,7 +16,7 @@ Vue.directive('theme', {
     bind(el, binding, vnode){
         if (binding.value == 'wide'){
             el.style.maxWidth = "1260px";
-        } else if (binding.value = 'narrow'){
+        } else if (binding.value == 'narrow'){
             el.style.maxWidth = "560px";
         }
         if(binding.arg == 'column'){