diff --git a/pkg/ruler/compat.go b/pkg/ruler/compat.go
index 879f3f82e3..b8c1630928 100644
--- a/pkg/ruler/compat.go
+++ b/pkg/ruler/compat.go
@@ -298,7 +298,7 @@ func DefaultTenantManagerFactory(cfg Config, p Pusher, q storage.Queryable, engi
 			QueryFunc:       RecordAndReportRuleQueryMetrics(MetricsQueryFunc(EngineQueryFunc(engine, q, overrides, userID), totalQueries, failedQueries), queryTime, logger),
 			Context:         user.InjectOrgID(ctx, userID),
 			ExternalURL:     cfg.ExternalURL.URL,
-			NotifyFunc:      SendAlerts(notifier, cfg.ExternalURL.URL.String()),
+			NotifyFunc:      SendAlerts(notifier, cfg.ExternalURL.String()),
 			Logger:          log.With(logger, "user", userID),
 			Registerer:      reg,
 			OutageTolerance: cfg.OutageTolerance,