diff --git a/cores/esp8266/core_esp8266_waveform_pwm.cpp b/cores/esp8266/core_esp8266_waveform_pwm.cpp
index 2107ef726c..916361e2ca 100644
--- a/cores/esp8266/core_esp8266_waveform_pwm.cpp
+++ b/cores/esp8266/core_esp8266_waveform_pwm.cpp
@@ -260,7 +260,7 @@ IRAM_ATTR bool _stopPWM_weak(uint8_t pin) {
   return true;
 }
 static bool _stopPWM_bound(uint8_t pin) __attribute__((weakref("_stopPWM_weak")));
-bool _stopPWM(uint8_t pin) {
+IRAM_ATTR bool _stopPWM(uint8_t pin) {
   return _stopPWM_bound(pin);
 }