diff --git a/Adafruit_NeoPixel.cpp b/Adafruit_NeoPixel.cpp
index 21fcc15..67bd531 100644
--- a/Adafruit_NeoPixel.cpp
+++ b/Adafruit_NeoPixel.cpp
@@ -187,7 +187,7 @@ extern "C" void rp2040Show(
 
 #if defined(ESP8266)
 // ESP8266 show() is external to enforce ICACHE_RAM_ATTR execution
-extern "C" void ICACHE_RAM_ATTR espShow(
+extern "C" IRAM_ATTR void espShow(
   uint16_t pin, uint8_t *pixels, uint32_t numBytes, uint8_t type);
 #elif defined(ESP32)
 extern "C" void espShow(
diff --git a/esp8266.c b/esp8266.c
index 53a074b..51c3f3c 100644
--- a/esp8266.c
+++ b/esp8266.c
@@ -17,8 +17,8 @@ static inline uint32_t _getCycleCount(void) {
 }
 
 #ifdef ESP8266
-void ICACHE_RAM_ATTR espShow(
- uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
+IRAM_ATTR void espShow(
+ uint8_t pin, uint8_t *pixels, uint32_t numBytes, __attribute__((unused)) boolean is800KHz) {
 #else
 void espShow(
  uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {