diff --git a/sm.h b/sm.h
index c6ae9c41c6..803e14ad93 100644
--- a/sm.h
+++ b/sm.h
@@ -25,10 +25,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QDataStream>
 #include <kapplication.h>
 #include <ksessionmanager.h>
-#include <X11/SM/SMlib.h>
 #include <netwm_def.h>
 #include <QRect>
 
+#include <X11/SM/SMlib.h>
+#include <fixx11h.h>
+
 class QSocketNotifier;
 
 namespace KWin