diff --git a/server.go b/server.go
index aa2b48f8400e8f63dab552cd57770f3d0c564e15..cb6a0f3badf9d56b2ee4b8d5a78adb53cf2cc3f8 100644
--- a/server.go
+++ b/server.go
@@ -15,7 +15,7 @@ import (
 
 var (
 	addr              = flag.String("addr", getenv("ADDR", ":3000"), "TCP `addr` to listen on")
-	karmaBackend      = flag.String("karma-url", getenv("ALERTS_URL", ""), "`URL` for the Karma backend")
+	karmaBackend      = flag.String("karma-url", getenv("KARMA_URL", ""), "`URL` for the Karma backend")
 	prometheusBackend = flag.String("prometheus-url", getenv("PROMETHEUS_URL", ""), "`URL` for the Prometheus backend")
 
 	rootDir = "/var/www"