diff --git a/compiler/cpp/src/main.h b/compiler/cpp/src/main.h
index a4f81b3..cd4b032 100644
--- a/compiler/cpp/src/main.h
+++ b/compiler/cpp/src/main.h
@@ -21,7 +21,10 @@
 #define T_MAIN_H
 
 #include <string>
+#include <cstdio>
+
 #include "logging.h"
+
 #include "parse/t_const.h"
 #include "parse/t_field.h"
 
@@ -99,6 +102,6 @@
 
 extern int yylineno;
 extern char yytext[];
-extern FILE* yyin;
+extern std::FILE* yyin;
 
 #endif