diff --git a/xs/src/slic3r/Utils/ASCIIFolding.cpp b/xs/src/slic3r/Utils/ASCIIFolding.cpp
index 381a330a06..53b860d65f 100644
--- a/xs/src/slic3r/Utils/ASCIIFolding.cpp
+++ b/xs/src/slic3r/Utils/ASCIIFolding.cpp
@@ -1,5 +1,6 @@
 #include "ASCIIFolding.hpp"
 
+#include <stdio.h>
 #include <locale>
 #include <boost/locale/encoding_utf.hpp>