diff --git a/static/locales/is.yaml b/static/locales/is.yaml
index 8f76402f..62f2df15 100644
--- a/static/locales/is.yaml
+++ b/static/locales/is.yaml
@@ -175,6 +175,7 @@ Settings:
       Dark: 'Dökkt'
       Light: 'Ljóst'
       Dracula: 'Drakúla'
+      System Default: Sjálfgefið í kerfinu
     Main Color Theme:
       Main Color Theme: 'Aðallitur þema'
       Red: 'Rautt'