diff --git a/lib/reducers/ui.js b/lib/reducers/ui.js
index 33537b5e..4209aaae 100644
--- a/lib/reducers/ui.js
+++ b/lib/reducers/ui.js
@@ -40,7 +40,7 @@ const initial = Immutable({
   fontSize: 12,
   padding: '12px 14px',
   fontFamily: 'Menlo, "DejaVu Sans Mono", "Lucida Console", monospace',
-  uiFontFamily: null,
+  uiFontFamily: '-apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif',
   fontSizeOverride: null,
   fontSmoothingOverride: 'antialiased',
   css: '',