diff --git a/esphome/components/debug/debug_component.h b/esphome/components/debug/debug_component.h
index 09f08a37ba..5783bc5418 100644
--- a/esphome/components/debug/debug_component.h
+++ b/esphome/components/debug/debug_component.h
@@ -28,7 +28,7 @@ static constexpr size_t RESET_REASON_BUFFER_SIZE = 128;
 #ifdef USE_ESP8266
 // ESP8266: Use vsnprintf_P to keep format strings in flash (PROGMEM)
 // Format strings must be wrapped with PSTR() macro
-inline size_t buf_append_P(char *buf, size_t size, size_t pos, PGM_P fmt, ...) {
+inline size_t buf_append_p(char *buf, size_t size, size_t pos, PGM_P fmt, ...) {
   if (pos >= size) {
     return size;
   }
@@ -41,7 +41,7 @@ inline size_t buf_append_P(char *buf, size_t size, size_t pos, PGM_P fmt, ...) {
   }
   return std::min(pos + static_cast<size_t>(written), size);
 }
-#define buf_append(buf, size, pos, fmt, ...) buf_append_P(buf, size, pos, PSTR(fmt), ##__VA_ARGS__)
+#define buf_append(buf, size, pos, fmt, ...) buf_append_p(buf, size, pos, PSTR(fmt), ##__VA_ARGS__)
 #else
 /// Safely append formatted string to buffer, returning new position (capped at size)
 __attribute__((format(printf, 4, 5))) inline size_t buf_append(char *buf, size_t size, size_t pos, const char *fmt,