diff --git a/wpa_supplicant/wpa_gui-qt4/networkconfig.cpp b/wpa_supplicant/wpa_gui-qt4/networkconfig.cpp
index ea8f47790..b963a7e36 100644
--- a/wpa_supplicant/wpa_gui-qt4/networkconfig.cpp
+++ b/wpa_supplicant/wpa_gui-qt4/networkconfig.cpp
@@ -12,6 +12,7 @@
  * See README and COPYING for more details.
  */
 
+#include <cstdio>
 #include <QMessageBox>
 
 #include "networkconfig.h"
diff --git a/wpa_supplicant/wpa_gui-qt4/scanresults.cpp b/wpa_supplicant/wpa_gui-qt4/scanresults.cpp
index bceef8ac2..459aa8c69 100644
--- a/wpa_supplicant/wpa_gui-qt4/scanresults.cpp
+++ b/wpa_supplicant/wpa_gui-qt4/scanresults.cpp
@@ -12,6 +12,8 @@
  * See README and COPYING for more details.
  */
 
+#include <cstdio>
+
 #include "scanresults.h"
 #include "wpagui.h"
 #include "networkconfig.h"
diff --git a/wpa_supplicant/wpa_gui-qt4/wpagui.cpp b/wpa_supplicant/wpa_gui-qt4/wpagui.cpp
index f4847c044..8f73967e1 100644
--- a/wpa_supplicant/wpa_gui-qt4/wpagui.cpp
+++ b/wpa_supplicant/wpa_gui-qt4/wpagui.cpp
@@ -17,6 +17,7 @@
 #include <unistd.h>
 #endif
 
+#include <cstdio>
 #include <QMessageBox>
 #include <QCloseEvent>