diff --git a/lib/health_monitor/providers/redis.rb b/lib/health_monitor/providers/redis.rb
index 9045df6..c80504c 100644
--- a/lib/health_monitor/providers/redis.rb
+++ b/lib/health_monitor/providers/redis.rb
@@ -52,12 +52,12 @@ def redis_connection
       end
 
       def check_values!
-        time = Time.now.to_formatted_s(:rfc2822)
+        time = Time.now
 
         @redis.set(@key, time)
         fetched = @redis.get(@key)
 
-        raise "different values (now: #{time}, fetched: #{fetched})" if fetched != time
+        raise "different values (now: #{time}, fetched: #{fetched})" if fetched != time.to_s
       end
 
       def check_max_used_memory!