diff --git a/forex_python/converter.py b/forex_python/converter.py
index bf465d0..567e9f8 100644
--- a/forex_python/converter.py
+++ b/forex_python/converter.py
@@ -37,8 +37,9 @@ def _decode_rates(self, response, use_decimal=False, date_str=None):
             decoded_data = json.loads(response.text, use_decimal=True)
         else:
             decoded_data = response.json()
-        # if (date_str and date_str != 'latest' and date_str != decoded_data.get('date')):
-        #     raise RatesNotAvailableError("Currency Rates Source Not Ready")
+        if (date_str and date_str != 'latest'
+                and date_str != decoded_data.get('date')):
+            raise RatesNotAvailableError("Currency Rates Source Not Ready")
         return decoded_data.get('rates', {})
 
     def _get_decoded_rate(