diff --git a/esp3d/src/core/esp3doutput.h b/esp3d/src/core/esp3doutput.h
index fcce2d0e..a2703089 100644
--- a/esp3d/src/core/esp3doutput.h
+++ b/esp3d/src/core/esp3doutput.h
@@ -40,7 +40,7 @@ class WebServer;
 #define WEBSERVER WebServer
 #endif //ARDUINO_ARCH_ESP32
 #if defined (ARDUINO_ARCH_ESP8266)
-class ESP8266WebServer;
+#include <ESP8266WebServer.h>
 #define WEBSERVER ESP8266WebServer
 #endif //ARDUINO_ARCH_ESP8266
 #endif //HTTP_FEATURE
diff --git a/esp3d/src/modules/authentication/authentication_service.h b/esp3d/src/modules/authentication/authentication_service.h
index a1ceef39..7ec2f575 100644
--- a/esp3d/src/modules/authentication/authentication_service.h
+++ b/esp3d/src/modules/authentication/authentication_service.h
@@ -48,7 +48,7 @@ class WebServer;
 typedef  WebServer Authwebserver;
 #endif //ARDUINO_ARCH_ESP32
 #if defined (ARDUINO_ARCH_ESP8266)
-class ESP8266WebServer;
+#include <ESP8266WebServer.h>
 typedef  ESP8266WebServer Authwebserver;
 #endif //ARDUINO_ARCH_ESP8266
 #else
diff --git a/esp3d/src/modules/http/http_server.h b/esp3d/src/modules/http/http_server.h
index bd0a7532..647f185c 100644
--- a/esp3d/src/modules/http/http_server.h
+++ b/esp3d/src/modules/http/http_server.h
@@ -28,7 +28,7 @@ class WebServer;
 #define WEBSERVER WebServer
 #endif //ARDUINO_ARCH_ESP32
 #if defined (ARDUINO_ARCH_ESP8266)
-class ESP8266WebServer;
+#include <ESP8266WebServer.h>
 #define WEBSERVER ESP8266WebServer
 #endif //ARDUINO_ARCH_ESP8266