diff --git a/lib/money/bank/open_exchange_rates_bank.rb b/lib/money/bank/open_exchange_rates_bank.rb
index bb7e229..3b52069 100644
--- a/lib/money/bank/open_exchange_rates_bank.rb
+++ b/lib/money/bank/open_exchange_rates_bank.rb
@@ -325,7 +325,7 @@ def read_from_cache
         result = if cache.is_a?(Proc)
                    cache.call(nil)
                  elsif File.exist?(cache.to_s)
-                   File.open(cache).read
+                   File.read(cache)
                  end
         result if valid_rates?(result)
       end