diff --git a/kstars/dialogs/focusdialog.cpp b/kstars/dialogs/focusdialog.cpp
--- a/kstars/dialogs/focusdialog.cpp
+++ b/kstars/dialogs/focusdialog.cpp
@@ -24,6 +24,7 @@
 #include "skyobjects/skypoint.h"
 
 #include <KLocalizedString>
+#include <QDoubleValidator>
 #include <KMessageBox>
 #include <QPushButton>