diff --git a/esphome/components/esp8266/core.cpp b/esphome/components/esp8266/core.cpp
index 51f3ca50ec..137d4382b4 100644
--- a/esphome/components/esp8266/core.cpp
+++ b/esphome/components/esp8266/core.cpp
@@ -27,7 +27,7 @@ void IRAM_ATTR HOT arch_feed_wdt() {
 uint8_t progmem_read_byte(const uint8_t *addr) {
   return pgm_read_byte(addr);  // NOLINT
 }
-uint32_t arch_get_cpu_cycle_count() {
+uint32_t IRAM_ATTR HOT arch_get_cpu_cycle_count() {
   return ESP.getCycleCount();  // NOLINT(readability-static-accessed-through-instance)
 }
 uint32_t arch_get_cpu_freq_hz() { return F_CPU; }