diff --git a/src/WebRequest.cpp b/src/WebRequest.cpp
index 53af540..1a1d6d5 100644
--- a/src/WebRequest.cpp
+++ b/src/WebRequest.cpp
@@ -97,7 +97,7 @@ AsyncWebServerRequest::~AsyncWebServerRequest(){
 }
 
 void AsyncWebServerRequest::_onData(void *buf, size_t len){
-  int i = 0;
+  size_t i = 0;
   while (true) {
 
   if(_parseState < PARSE_REQ_BODY){