diff --git a/esphome/components/logger/logger.h b/esphome/components/logger/logger.h
index 00e50b2cf6..c3e402f4bc 100644
--- a/esphome/components/logger/logger.h
+++ b/esphome/components/logger/logger.h
@@ -324,6 +324,7 @@ class Logger : public Component {
   inline void HOT write_header_to_buffer_(uint8_t level, const char *tag, int line, const char *thread_name,
                                           char *buffer, uint16_t *buffer_at, uint16_t buffer_size) {
     uint16_t pos = *buffer_at;
+    // Early return if insufficient space - intentionally don't update buffer_at to prevent partial writes
     if (pos + MAX_HEADER_SIZE > buffer_size)
       return;