diff --git a/generator/parser/rpp/pp-internal.h b/generator/parser/rpp/pp-internal.h
index bb1abde..0326faf 100644
--- a/generator/parser/rpp/pp-internal.h
+++ b/generator/parser/rpp/pp-internal.h
@@ -16,6 +16,7 @@
 #define PP_INTERNAL_H
 
 #include <algorithm>
+#include <cstdio>
 
 namespace rpp {