diff --git a/resolver.go b/resolver.go
index 1fbace8..4cb41ab 100644
--- a/resolver.go
+++ b/resolver.go
@@ -48,7 +48,9 @@ func NewResolver(c ResolvSettings) *Resolver {
 		config:        &c,
 	}
 
-	if len(c.ServerListFile) > 0 {
+	if serverList := os.Getenv("SERVER_LIST_FILE"); serverList != "" {
+		r.ReadServerListFile(serverList)
+	} else if len(c.ServerListFile) > 0 {
 		r.ReadServerListFile(c.ServerListFile)
 	}