diff --git a/esphome/components/esp32_ble/ble_advertising.cpp b/esphome/components/esp32_ble/ble_advertising.cpp
index df70768c23..68704e49e2 100644
--- a/esphome/components/esp32_ble/ble_advertising.cpp
+++ b/esphome/components/esp32_ble/ble_advertising.cpp
@@ -152,7 +152,7 @@ void BLEAdvertising::loop() {
   if (now - this->last_advertisement_time_ > this->advertising_cycle_time_) {
     this->stop();
     this->current_adv_index_ += 1;
-    if (this->current_adv_index_ >= this->raw_advertisements_callbacks_.size()) {
+    if (static_cast<size_t>(this->current_adv_index_) >= this->raw_advertisements_callbacks_.size()) {
       this->current_adv_index_ = -1;
     }
     this->start();