diff --git a/spec/money/distributed/storage_spec.rb b/spec/money/distributed/storage_spec.rb
index 1172e36..f50e8e4 100644
--- a/spec/money/distributed/storage_spec.rb
+++ b/spec/money/distributed/storage_spec.rb
@@ -40,14 +40,14 @@
     let(:storage) { subject }
     let(:rates) do
       {
-        'USD_TO_EUR' => '0.85',
-        'EUR_TO_USD' => '1.18',
+        'USD_TO_EUR' => BigDecimal('0.85'),
+        'EUR_TO_USD' => BigDecimal('1.18'),
       }
     end
 
     before do
       rates.each do |key, rate|
-        redis.hset(described_class::REDIS_KEY, key, rate)
+        redis.hset(described_class::REDIS_KEY, key, rate.to_s)
       end
     end