diff --git a/src/frontends/qt4/GuiBranches.cpp b/src/frontends/qt4/GuiBranches.cpp
index 9c59f125e4..9445a16567 100644
--- a/src/frontends/qt4/GuiBranches.cpp
+++ b/src/frontends/qt4/GuiBranches.cpp
@@ -37,6 +37,9 @@
 #include <QColor>
 #include <QColorDialog>
 
+#ifdef KeyPress
+#undef KeyPress
+#endif
 
 namespace lyx {
 namespace frontend {