diff --git a/examples/SimpleServer/SimpleServer.ino b/examples/SimpleServer/SimpleServer.ino
index f2b3c0a..5b2e555 100644
--- a/examples/SimpleServer/SimpleServer.ino
+++ b/examples/SimpleServer/SimpleServer.ino
@@ -781,8 +781,10 @@ void loop() {
     // }
     lastWS = millis();
   }
-  if(now - lastHeap >= 2000) {
+#ifdef ESP32
+  if (now - lastHeap >= 2000) {
     Serial.printf("Free heap: %" PRIu32 "\n", ESP.getFreeHeap());
     lastHeap = now;
   }
+#endif
 }