diff --git a/src/plugins/qt4projectmanager/qt-maemo/maemodeviceconfigurations.cpp b/src/plugins/qt4projectmanager/qt-maemo/maemodeviceconfigurations.cpp
index 9caad09775c..cb0337d3f5e 100644
--- a/src/plugins/qt4projectmanager/qt-maemo/maemodeviceconfigurations.cpp
+++ b/src/plugins/qt4projectmanager/qt-maemo/maemodeviceconfigurations.cpp
@@ -42,6 +42,7 @@
 #include <QtGui/QDesktopServices>
 
 #include <algorithm>
+#include <cctype>
 
 typedef Core::SshConnectionParameters::AuthType AuthType;