diff --git a/cores/esp8266/Updater.cpp b/cores/esp8266/Updater.cpp
index 03bc5c3f8f..e5224e3814 100644
--- a/cores/esp8266/Updater.cpp
+++ b/cores/esp8266/Updater.cpp
@@ -113,6 +113,8 @@ bool UpdaterClass::begin(size_t size, int command, int ledPin, uint8_t ledOn) {
 
   _reset();
   clearError(); //  _error = 0
+  _target_md5 = emptyString;
+  _md5 = MD5Builder();
 
 #ifndef HOST_MOCK
   wifi_set_sleep_type(NONE_SLEEP_T);