diff --git a/locales/es-ES/browser/browser/zen-general.ftl b/locales/es-ES/browser/browser/zen-general.ftl
index 7adddfa2b..364db9023 100644
--- a/locales/es-ES/browser/browser/zen-general.ftl
+++ b/locales/es-ES/browser/browser/zen-general.ftl
@@ -38,6 +38,7 @@ zen-library-sidebar-workspaces =
 zen-library-sidebar-mods = 
     .label = Mods
 zen-toggle-compact-mode-button = 
+    .label = Modo compacto
     .tooltiptext = Alternar modo compacto
 
 # note: Do not translate the "<br/>" tags in the following string