diff --git a/include/HTTPServer.h b/include/HTTPServer.h
index 2efb5a4..f4432e5 100644
--- a/include/HTTPServer.h
+++ b/include/HTTPServer.h
@@ -43,7 +43,7 @@
 #include "esp_eth.h"
 #include "mbedtls/base64.h"
 
-#define MAX_DYNVAR_LENGTH 64
+#define MAX_DYNVAR_LENGTH 256
 #define MAX_INCFILE_LENGTH 1024
 
 #define HTTP_SERVER_DEBUG_LEVEL 0