diff --git a/libraries/WiFi/src/WiFiClient.cpp b/libraries/WiFi/src/WiFiClient.cpp
index 95c63c29..5b8c0fb6 100644
--- a/libraries/WiFi/src/WiFiClient.cpp
+++ b/libraries/WiFi/src/WiFiClient.cpp
@@ -274,7 +274,7 @@ int WiFiClient::available()
         return 0;
     }
     int count;
-    int res = ioctl(fd(), FIONREAD, &count);
+    int res = lwip_ioctl_r(fd(), FIONREAD, &count);
     if(res < 0) {
         log_e("%d", errno);
         stop();