diff --git a/server/http.go b/server/http.go
index 7d55c32bd..7816f07ba 100644
--- a/server/http.go
+++ b/server/http.go
@@ -198,7 +198,7 @@ func (s *HTTPd) RegisterSiteHandlers(site site.API) {
 		"smartcostdelete":         {"DELETE", "/smartcostlimit", updateSmartCostLimit(site, smartCostLimit)},
 		"smartfeedin":             {"POST", "/smartfeedinprioritylimit/{value:-?[0-9.]+}", updateSmartCostLimit(site, smartFeedInPriorityLimit)},
 		"smartfeedindelete":       {"DELETE", "/smartfeedinprioritylimit", updateSmartCostLimit(site, smartFeedInPriorityLimit)},
-		"tariff":                  {"GET", "/tariff/{tariff:[a-z]+}", tariffHandler(site)},
+		"tariff":                  {"GET", "/tariff/{tariff:[a-z0-9]+}", tariffHandler(site)},
 		"sessions":                {"GET", "/sessions", sessionHandler},
 		"updatesession":           {"PUT", "/session/{id:[0-9]+}", updateSessionHandler},
 		"deletesession":           {"DELETE", "/session/{id:[0-9]+}", deleteSessionHandler},