diff --git a/libraries/HTTPUpdateServer/src/HTTPUpdateServer.h b/libraries/HTTPUpdateServer/src/HTTPUpdateServer.h
index 65d8cbaa783..b59a071fd9a 100644
--- a/libraries/HTTPUpdateServer/src/HTTPUpdateServer.h
+++ b/libraries/HTTPUpdateServer/src/HTTPUpdateServer.h
@@ -123,7 +123,7 @@ class HTTPUpdateServer {
             Serial.printf("Update: %s\n", upload.filename.c_str());
           }
           if (upload.name == "filesystem") {
-            if (!Update.begin(SPIFFS.totalBytes(), U_SPIFFS)) {  //start with max available size
+            if (!Update.begin(UPDATE_SIZE_UNKNOWN, U_SPIFFS)) {  //Instead of SPIFFS.totalBytes(). Fix https://github.com/espressif/arduino-esp32/issues/9967
               if (_serial_output) {
                 Update.printError(Serial);
               }