diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
index 1291ca86..411a114c 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
@@ -155,4 +155,4 @@ fun InvocationHandler.callSuper(interfaceClass: Class<*>, proxy: Any, method: Me
 
 fun if_nametoindex(ifname: String) = if (Build.VERSION.SDK_INT >= 26) {
     Os.if_nametoindex(ifname)
-} else File("/sys/class/net/$ifname/ifindex").inputStream().bufferedReader().readText().toInt()
+} else File("/sys/class/net/$ifname/ifindex").inputStream().bufferedReader().use { it.readLine().toInt() }