diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index e838c82f3e..4dcd44a574 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -217,6 +217,8 @@ template<typename T> class FixedVector {
     reset_();
     if (n > 0) {
       // Allocate raw memory without calling constructors
+      // sizeof(T) is correct here - when T is a pointer type, we want the pointer size
+      // NOLINTNEXTLINE(bugprone-sizeof-expression)
       data_ = static_cast<T *>(::operator new(n * sizeof(T)));
       capacity_ = n;
     }