diff --git a/src/esp_platform.cpp b/src/esp_platform.cpp
index 41ea914..658efd2 100644
--- a/src/esp_platform.cpp
+++ b/src/esp_platform.cpp
@@ -42,7 +42,7 @@ uint32_t EspPlatform::uniqueSerialNumber()
 {
     uint32_t chipid = ESP.getChipId();
     
-    Serial.printf("uniqueSerialNumber: %0X\n", chipId);
+    Serial.printf("uniqueSerialNumber: %0X\n", chipid);
 
     return chipId;
 }