diff --git a/spec/spec-helper.es6 b/spec/spec-helper.es6
index 41be1cf67..e9295c520 100644
--- a/spec/spec-helper.es6
+++ b/spec/spec-helper.es6
@@ -21,7 +21,7 @@ NylasEnv.themes.requireStylesheet('../static/jasmine');
 NylasEnv.themes.initialLoadComplete = true;
 
 NylasEnv.keymaps.loadKeymaps();
-let styleElementsToRestore = NylasEnv.styles.getSnapshot();
+const styleElementsToRestore = NylasEnv.styles.getSnapshot();
 
 window.addEventListener('core:close', () => window.close());
 window.addEventListener('beforeunload', function() {