diff --git a/arduino/beken-72xx/cores/arduino/Arduino.h b/arduino/beken-72xx/cores/arduino/Arduino.h
index 84b8544..c2df300 100644
--- a/arduino/beken-72xx/cores/arduino/Arduino.h
+++ b/arduino/beken-72xx/cores/arduino/Arduino.h
@@ -6,8 +6,10 @@
 #include "WCharacterFixup.h"
 #endif
 
+#define delay delayMilliseconds // change delay()'s signature - it's defined as static inline in WVariant.h
 #include <api/ArduinoAPI.h>
 #include <core/LibreTuyaAPI.h>
+#undef delay
 
 // Include family-specific code
 #include "WVariant.h"
diff --git a/arduino/beken-72xx/cores/arduino/WVariant.h b/arduino/beken-72xx/cores/arduino/WVariant.h
index 1fda7a0..cbe3777 100644
--- a/arduino/beken-72xx/cores/arduino/WVariant.h
+++ b/arduino/beken-72xx/cores/arduino/WVariant.h
@@ -9,9 +9,10 @@ extern "C" {
 #include "sdk_extern.h"
 #include "sdk_mem.h"
 
-// allow BDK use its own delay() and let Arduino code use delayMilliseconds()
-void delayMilliseconds(unsigned long);
-#define delay delayMilliseconds
+// define an inline delay() which overrides BDK's delay()
+static inline __attribute__((always_inline)) void delay(unsigned long ms) {
+	delayMilliseconds(ms);
+}
 
 // from fixups/arch_main.c
 extern unsigned char __bk_rf_is_init;
diff --git a/platform.json b/platform.json
index c705341..6f0db2f 100644
--- a/platform.json
+++ b/platform.json
@@ -127,7 +127,7 @@
     },
     "tool-ltchiptool": {
       "type": "uploader",
-      "version": "https://github.com/libretuya/ltchiptool#v1.6.0",
+      "version": "https://github.com/libretuya/ltchiptool#v1.6.1",
       "note": "This is used only for C/C++ code from ltchiptool."
     },
     "tool-openocd": {