diff --git a/modules/gui/src/data_viewer/data_viewer_panel_base.cc b/modules/gui/src/data_viewer/data_viewer_panel_base.cc
index f946bc5c8793d152d4e0a2780cf9a9c87bf8febb..68077d89aa304c55dc7b654081bea556e276a3f7 100644
--- a/modules/gui/src/data_viewer/data_viewer_panel_base.cc
+++ b/modules/gui/src/data_viewer/data_viewer_panel_base.cc
@@ -599,7 +599,7 @@ void DataViewerPanelBase::mouseMoveEvent(QMouseEvent* event)
       }
     }
     update_rubberband_from_selection_();
-  } else if((event->buttons() == Qt::MidButton) && HasSelection()) {
+  } else if((event->buttons() == Qt::MiddleButton) && HasSelection()) {
     update_rubberband_from_selection_();
   }
   last_x_=event->x();
diff --git a/modules/gui/src/gl_canvas.cc b/modules/gui/src/gl_canvas.cc
index da2eb2816093828839c51e9f9cc2f99f85662eb9..372e344c3982d9c9f71a01499e6259af211dd9c8 100644
--- a/modules/gui/src/gl_canvas.cc
+++ b/modules/gui/src/gl_canvas.cc
@@ -370,7 +370,7 @@ void GLCanvas::HandleMouseMoveEvent(QMouseEvent* event) {
 
   QPoint delta=QPoint(event->x(), event->y())-last_pos_;
   if (event->buttons() & Qt::LeftButton) {
-    if (event->buttons() & Qt::MidButton) {
+    if (event->buttons() & Qt::MiddleButton) {
       if (event->modifiers() & Qt::ShiftModifier) {
         OnTransform(gfx::INPUT_COMMAND_SLABN,indx,
                     trg,0.5*static_cast<Real>(-delta.x()));
@@ -396,7 +396,7 @@ void GLCanvas::HandleMouseMoveEvent(QMouseEvent* event) {
       }
 
     }
-  } else if (event->buttons() & Qt::MidButton) {
+  } else if (event->buttons() & Qt::MiddleButton) {
       if (event->modifiers() & Qt::ShiftModifier) {
         OnTransform(gfx::INPUT_COMMAND_SLABN,indx,trg,
                     0.5*static_cast<Real>(-delta.x()));
diff --git a/modules/gui/src/tools/mouse_event.hh b/modules/gui/src/tools/mouse_event.hh
index bd08115d50d3bd241c59a2cbf23b6ec158c13dc4..05ccb00e7fcf17a33eeaa3a8f39838354d7f48e5 100644
--- a/modules/gui/src/tools/mouse_event.hh
+++ b/modules/gui/src/tools/mouse_event.hh
@@ -34,7 +34,7 @@ public:
   typedef enum {
     LeftButton=Qt::LeftButton,
     RightButton=Qt::RightButton,
-    MiddleButton=Qt::MidButton
+    MiddleButton=Qt::MiddleButton
   } Button;
   typedef int Buttons;
 public: