diff --git a/src/Gui/Inventor/SoToggleSwitch.cpp b/src/Gui/Inventor/SoToggleSwitch.cpp
index 0fc1694220..73447d4426 100644
--- a/src/Gui/Inventor/SoToggleSwitch.cpp
+++ b/src/Gui/Inventor/SoToggleSwitch.cpp
@@ -21,6 +21,8 @@
  *                                                                          *
  ***************************************************************************/
 
+#include "PreCompiled.h"
+
 #include "SoToggleSwitch.h"
 
 SO_NODE_SOURCE(SoToggleSwitch)