diff --git a/loader.h b/loader.h
index ee7f155..e185c2b 100644
--- a/loader.h
+++ b/loader.h
@@ -54,7 +54,7 @@
 
 #define FTP_RETRY_NUM 3
 
-using CURL = void;
+#include <curl/curl.h>
 
 struct C_Element {
     Coordinate coordinate; // coordinate * cubeEdgeLength = minimal coordinate in the cube; NOT center coordinate