diff --git a/tools/lammps-gui/codeeditor.cpp b/tools/lammps-gui/codeeditor.cpp
index c4690c3d7f..37e6820452 100644
--- a/tools/lammps-gui/codeeditor.cpp
+++ b/tools/lammps-gui/codeeditor.cpp
@@ -34,7 +34,6 @@
 #include <QSettings>
 #include <QShortcut>
 #include <QStringListModel>
-#include <QStringRef>
 #include <QTextBlock>
 #include <QTextDocumentFragment>
 #include <QUrl>