diff --git a/lib/i18n/locale/fallbacks.rb b/lib/i18n/locale/fallbacks.rb
index e30acc43..a8f8b3e0 100644
--- a/lib/i18n/locale/fallbacks.rb
+++ b/lib/i18n/locale/fallbacks.rb
@@ -74,6 +74,7 @@ def map(*args, &block)
               @map[from] << _to.to_sym
             end
           end
+          replace @map
         else
           @map.map(*args, &block)
         end