diff --git a/src/index.js b/src/index.js
index f6fc361..ba82208 100644
--- a/src/index.js
+++ b/src/index.js
@@ -15,7 +15,7 @@ const FILE_MAPPING = {
 };
 
 for (const src in FILE_MAPPING) {
-   dest = FILE_MAPPING[src];
+   const dest = FILE_MAPPING[src];
    document.querySelectorAll(`[data-background-image='${src}']`).forEach(e => {
       e.dataset.backgroundImage = dest;
    })