diff --git a/src/WebOTA.cpp b/src/WebOTA.cpp
index 0a2005c..a00571f 100644
--- a/src/WebOTA.cpp
+++ b/src/WebOTA.cpp
@@ -201,8 +201,8 @@ int WebOTA::add_http_routes(WebServer *server, const char *path) {
 
 // If the MCU is in a delay() it cannot respond to HTTP OTA requests
 // We do a "fake" looping delay and listen for incoming HTTP requests while waiting
-void WebOTA::delay(int ms) {
-	int last = millis();
+void WebOTA::delay(unsigned int ms) {
+	unsigned int last = millis();
 
 	while ((millis() - last) < ms) {
 		OTAServer.handleClient();
diff --git a/src/WebOTA.h b/src/WebOTA.h
index 794a90c..801f60d 100644
--- a/src/WebOTA.h
+++ b/src/WebOTA.h
@@ -16,7 +16,7 @@ class WebOTA {
 		int init(const unsigned int port, const char *path);
 		int init(const unsigned int port);
 		int init();
-		void delay(int ms);
+		void delay(unsigned int ms);
 
 #ifdef ESP8266
 		int add_http_routes(ESP8266WebServer *server, const char *path);