diff --git a/libraries/Update/src/Update.h b/libraries/Update/src/Update.h
index 42fa591b..2bf4dc46 100644
--- a/libraries/Update/src/Update.h
+++ b/libraries/Update/src/Update.h
@@ -162,12 +162,12 @@ class UpdateClass {
     bool _verifyHeader(uint8_t data);
     bool _verifyEnd();
 
-    THandlerFunction_Progress _progress_callback;
 
     uint8_t _error;
     uint8_t *_buffer;
     size_t _bufferLen;
     size_t _size;
+    THandlerFunction_Progress _progress_callback;
     uint32_t _progress;
     uint32_t _command;
     const esp_partition_t* _partition;
diff --git a/libraries/Update/src/Updater.cpp b/libraries/Update/src/Updater.cpp
index ad35a8d7..d2ea1e9b 100644
--- a/libraries/Update/src/Updater.cpp
+++ b/libraries/Update/src/Updater.cpp
@@ -68,10 +68,10 @@ UpdateClass::UpdateClass()
 , _buffer(0)
 , _bufferLen(0)
 , _size(0)
+, _progress_callback(NULL)
 , _progress(0)
 , _command(U_FLASH)
 , _partition(NULL)
-, _progress_callback(NULL)
 {
 }