diff --git a/kdesktop/lock/infodlg.h b/kdesktop/lock/infodlg.h
index df446f592..a0ca3b8c0 100644
--- a/kdesktop/lock/infodlg.h
+++ b/kdesktop/lock/infodlg.h
@@ -11,6 +11,8 @@
 #include <tqdialog.h>
 #include <tqstringlist.h>
 
+#include "lockprocess.h"
+
 class TQFrame;
 class TQGridLayout;
 class TQLabel;
diff --git a/kdesktop/lock/lockdlg.h b/kdesktop/lock/lockdlg.h
index 6ef33c51e..258339314 100644
--- a/kdesktop/lock/lockdlg.h
+++ b/kdesktop/lock/lockdlg.h
@@ -14,6 +14,8 @@
 #include <tqdialog.h>
 #include <tqstringlist.h>
 
+#include "lockprocess.h"
+
 struct GreeterPluginHandle;
 class LockProcess;
 class TQFrame;
diff --git a/kdesktop/lock/querydlg.h b/kdesktop/lock/querydlg.h
index c9175b4ea..e6a768369 100644
--- a/kdesktop/lock/querydlg.h
+++ b/kdesktop/lock/querydlg.h
@@ -13,6 +13,8 @@
 
 #include <kpassdlg.h>
 
+#include "lockprocess.h"
+
 class TQFrame;
 class TQGridLayout;
 class TQLabel;