diff --git a/main.go b/main.go
index dc746db..95806e9 100644
--- a/main.go
+++ b/main.go
@@ -40,6 +40,11 @@ func main() {
 	mux.HandleFunc("/ln", lnurlw_response)
 	mux.HandleFunc("/cb", lnurlw_callback)
 
-	err := http.ListenAndServe(":9000", mux)
+	port := os.Getenv("HOST_PORT")
+	if len(value) == 0 {
+		port := "9000"
+	}
+	
+	err := http.ListenAndServe(":" + port, mux)
 	log.Fatal(err)
 }