--- src/lib/data.cpp
+++ src/lib/data.cpp
@@ -22,6 +22,8 @@
 #  include "config.h"
 #endif
 
+#include <cstdio>
+
 #include "kmp.h"
 
 #include "data.hpp"
--- src/lib/stardict_client.cpp
+++ src/lib/stardict_client.cpp
@@ -22,6 +22,8 @@
 #  include "config.h"
 #endif
 
+#include <cstdio>
+
 #include <glib.h>
 #include <glib/gi18n.h>