diff --git a/src/AsyncJson.h b/src/AsyncJson.h
index 6fc5eb7..167364a 100644
--- a/src/AsyncJson.h
+++ b/src/AsyncJson.h
@@ -99,12 +99,12 @@ typedef std::function<void(AsyncWebServerRequest* request, JsonVariant& json)> A
 
 class AsyncCallbackJsonWebHandler : public AsyncWebHandler {
   protected:
-    const String _uri;
+    String _uri;
     WebRequestMethodComposite _method;
     ArJsonRequestHandlerFunction _onRequest;
     size_t _contentLength;
   #if ARDUINOJSON_VERSION_MAJOR == 6
-    const size_t maxJsonBufferSize;
+    size_t maxJsonBufferSize;
   #endif
     size_t _maxContentLength;
 
diff --git a/src/AsyncMessagePack.h b/src/AsyncMessagePack.h
index 3194b5a..9ac5ee5 100644
--- a/src/AsyncMessagePack.h
+++ b/src/AsyncMessagePack.h
@@ -72,12 +72,12 @@ typedef std::function<void(AsyncWebServerRequest* request, JsonVariant& json)> A
 
 class AsyncCallbackMessagePackWebHandler : public AsyncWebHandler {
   protected:
-    const String _uri;
+    String _uri;
     WebRequestMethodComposite _method;
     ArMessagePackRequestHandlerFunction _onRequest;
     size_t _contentLength;
   #if ARDUINOJSON_VERSION_MAJOR == 6
-    const size_t maxJsonBufferSize;
+    size_t maxJsonBufferSize;
   #endif
     size_t _maxContentLength;