diff -u -t -u src/fluxbox.cc.orig src/fluxbox.cc
--- src/fluxbox.cc.orig	2013-09-16 10:51:30.000000000 -0600
+++ src/fluxbox.cc	2013-09-16 10:49:18.000000000 -0600
@@ -1355,7 +1355,7 @@
         FocusControl::setFocusedWindow(0);
 }
 
-bool Fluxbox::validateClient(const WinClient *client) const {
+bool Fluxbox::validateClient(WinClient *client) const {
     WinClientMap::const_iterator it =
         find_if(m_window_search.begin(),
                 m_window_search.end(),
diff -u -t -u src/fluxbox.hh.orig src/fluxbox.hh
--- src/fluxbox.hh.orig	2013-09-16 10:51:30.000000000 -0600
+++ src/fluxbox.hh	2013-09-16 10:49:18.000000000 -0600
@@ -88,7 +88,7 @@
     /// main event loop
     void eventLoop();
     bool validateWindow(Window win) const;
-    bool validateClient(const WinClient *client) const;
+    bool validateClient(WinClient *client) const;
 
     void grab();
     void ungrab();