diff --git a/src/WebHandlers.cpp b/src/WebHandlers.cpp
index ac9e963aa..1a3de2e87 100644
--- a/src/WebHandlers.cpp
+++ b/src/WebHandlers.cpp
@@ -234,7 +234,11 @@ void AsyncStaticWebHandler::handleRequest(AsyncWebServerRequest *request) {
       size_t fileSize = request->_tempFile.size();
       etagValue = static_cast<uint32_t>(fileSize);
     }
+#ifndef ESP8266
+    snprintf(etag, sizeof(etag), "%08lx", etagValue);
+#else
     snprintf(etag, sizeof(etag), "%08x", etagValue);
+#endif
   } else {
     etag[0] = '\0';
   }