diff --git a/esphome/components/esphome/ota/ota_esphome.h b/esphome/components/esphome/ota/ota_esphome.h
index c09ad843f88..2da6e7dcd64 100644
--- a/esphome/components/esphome/ota/ota_esphome.h
+++ b/esphome/components/esphome/ota/ota_esphome.h
@@ -92,9 +92,10 @@ class ESPHomeOTAComponent final : public ota::OTAComponent {
   std::unique_ptr<uint8_t[]> auth_buf_;
 #endif  // USE_OTA_PASSWORD
 #ifdef USE_OTA_PARTITIONS
-  bool extended_proto_{false};
+  // 4-byte members first, 1-byte member last to minimize padding.
   uint32_t running_app_offset_{0};
   size_t running_app_size_{0};
+  bool extended_proto_{false};
 #endif
 
   socket::ListenSocket *server_{nullptr};