diff --git a/platformio.ini b/platformio.ini
index be9651ce..6ac5ff55 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -90,7 +90,7 @@ src_filter = +<*> -<.git/> -<examples/> -<test/> -<tests/> -<stm32f4/> -<lv_font
 ; -- Platform specific build flags
 [esp32]
 framework = arduino
-platform = espressif32
+platform = espressif32@^3.10006.210326
 
 board_upload.flash_size=4MB
 board_upload.maximum_size = 4194304
diff --git a/src/sys/svc/hasp_http.cpp b/src/sys/svc/hasp_http.cpp
index ba27e1a2..2c4c21aa 100644
--- a/src/sys/svc/hasp_http.cpp
+++ b/src/sys/svc/hasp_http.cpp
@@ -900,14 +900,15 @@ void webHandleFirmwareUpload()
             // WiFiUDP::stopAll();
 
             int command = webServer.arg(F("cmd")).toInt();
-            size_t size;
+            size_t size = 0;
             if(command == U_FLASH) {
                 size = (ESP.getFreeSketchSpace() - 0x1000) & 0xFFFFF000;
             } else if(command == U_SPIFFS) {
                 size = UPDATE_SIZE_UNKNOWN;
             }
             // if(!Update.begin(UPDATE_SIZE_UNKNOWN)) { // start with max available size
-            if(!Update.begin(size, command, -1, 0U, "spiffs")) { // start with max available size
+            const char label[] = "spiffs";
+            if(!Update.begin(size, command, -1, 0U, (const char*)label)) { // start with max available size
                 webUpdatePrintError();
             }
             break;