diff --git a/lib/btc_sell_prices.rb b/lib/btc_sell_prices.rb
index e80aaf62701755ad0170e7f7a95385c25a087624..313ae92bb8f4a979b520414e376af108e3f3fdc6 100644
--- a/lib/btc_sell_prices.rb
+++ b/lib/btc_sell_prices.rb
@@ -52,7 +52,7 @@ protected
 				@oxr.update_rates
 				@oxr.get_rate("CAD", "USD")
 			}.then do |orate|
-				@redis.set("cad_to_usd", orate, ex: 60 * 60).then { orate }
+				@redis.setex("cad_to_usd", orate, 60 * 60).then { orate }
 			end
 		end
 	end