diff --git a/src/frontends/qt4/GuiMathMatrix.cpp b/src/frontends/qt4/GuiMathMatrix.cpp
index cce00c20cf..8106629d99 100644
--- a/src/frontends/qt4/GuiMathMatrix.cpp
+++ b/src/frontends/qt4/GuiMathMatrix.cpp
@@ -19,7 +19,6 @@
 #include "FuncRequest.h"
 
 #include "support/gettext.h"
-#include "support/docstring.h"
 
 #include <QLineEdit>
 #include <QPushButton>