diff --git a/examples/plugins/gui_overlay_plugin_spawn/GUIExampleSpawnWidget.hh b/examples/plugins/gui_overlay_plugin_spawn/GUIExampleSpawnWidget.hh
index 09b39ed557..4798b9800c 100644
--- a/examples/plugins/gui_overlay_plugin_spawn/GUIExampleSpawnWidget.hh
+++ b/examples/plugins/gui_overlay_plugin_spawn/GUIExampleSpawnWidget.hh
@@ -19,7 +19,10 @@
 
 #include <gazebo/common/Plugin.hh>
 #include <gazebo/gui/GuiPlugin.hh>
+// moc parsing error of tbb headers
+#ifndef Q_MOC_RUN
 #include <gazebo/transport/transport.hh>
+#endif
 
 namespace gazebo
 {
diff --git a/examples/plugins/gui_overlay_plugin_time/GUIExampleTimeWidget.hh b/examples/plugins/gui_overlay_plugin_time/GUIExampleTimeWidget.hh
index 1ef72502c5..a3c8352be8 100644
--- a/examples/plugins/gui_overlay_plugin_time/GUIExampleTimeWidget.hh
+++ b/examples/plugins/gui_overlay_plugin_time/GUIExampleTimeWidget.hh
@@ -21,7 +21,10 @@
 
 #include <gazebo/common/Plugin.hh>
 #include <gazebo/gui/GuiPlugin.hh>
+// moc parsing error of tbb headers
+#ifndef Q_MOC_RUN
 #include <gazebo/transport/transport.hh>
+#endif
 
 namespace gazebo
 {
diff --git a/examples/plugins/mainwindow_example/MainWindowExampleWidget.hh b/examples/plugins/mainwindow_example/MainWindowExampleWidget.hh
index 36947adff8..7659466495 100644
--- a/examples/plugins/mainwindow_example/MainWindowExampleWidget.hh
+++ b/examples/plugins/mainwindow_example/MainWindowExampleWidget.hh
@@ -22,7 +22,10 @@
 
 #include <gazebo/common/Plugin.hh>
 #include <gazebo/gui/GuiPlugin.hh>
+// moc parsing error of tbb headers
+#ifndef Q_MOC_RUN
 #include <gazebo/transport/transport.hh>
+#endif
 
 namespace gazebo
 {