diff --git a/src/config.js b/src/config.js
index ff16aea..6d7d7f2 100644
--- a/src/config.js
+++ b/src/config.js
@@ -61,7 +61,7 @@ function addMapping(key, directory) {
     let mappings = new Map(JSON.parse(localStorage.getItem('mappings')) || []);
     statusLine.innerHTML = (mappings.has(key) ? "Changed" : "Added") + ` mapping '${key}' - '${directory}'`;
     mappings.set(key, directory);
-    localStorage.setItem('mappings', JSON.stringify(Array.from(mappings.entries())));
+    localStorage.setItem('mappings', JSON.stringify(Array.from(mappings.entries()).sort()));
     renderMappings();
 }