diff --git a/modules/gui/qt4/input_manager.cpp b/modules/gui/qt4/input_manager.cpp
index 0b88bc3f4b998a350265d618bc1fde1788e31474..663a5336000b75abcc97dbc66280cb22e622c491 100644
--- a/modules/gui/qt4/input_manager.cpp
+++ b/modules/gui/qt4/input_manager.cpp
@@ -21,8 +21,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
-#include <assert.h>
-
 #include "qt4.hpp"
 #include "input_manager.hpp"
 #include "dialogs_provider.hpp"