diff --git a/src/AudioKitHAL.h b/src/AudioKitHAL.h
index 1c2ce04..ec19e44 100644
--- a/src/AudioKitHAL.h
+++ b/src/AudioKitHAL.h
@@ -50,8 +50,8 @@ typedef uint32_t eps32_i2s_audio_sample_rate_type;
 #endif
 
 // Define LED_BUILTIN 
-#undef LED_BUILTIN
 #if defined(GREEN_LED_GPIO) 
+#  undef LED_BUILTIN
 #  define LED_BUILTIN GREEN_LED_GPIO
 #endif