diff --git a/src/Gui/Application.cpp b/src/Gui/Application.cpp
index cf95615912..9cd4ac9bb4 100644
--- a/src/Gui/Application.cpp
+++ b/src/Gui/Application.cpp
@@ -24,6 +24,8 @@
 
 #ifndef _PreComp_
 # include <boost/interprocess/sync/file_lock.hpp>
+# include <Inventor/errors/SoDebugError.h>
+# include <Inventor/errors/SoError.h>
 # include <QCloseEvent>
 # include <QDir>
 # include <QFileInfo>
diff --git a/src/Gui/InventorAll.h b/src/Gui/InventorAll.h
index 997345c4f7..bf30ee87e2 100644
--- a/src/Gui/InventorAll.h
+++ b/src/Gui/InventorAll.h
@@ -114,6 +114,7 @@
 #include <Inventor/engines/SoComposeRotationFromTo.h>
 #include <Inventor/engines/SoComposeRotation.h>
 #include <Inventor/errors/SoDebugError.h>
+#include <Inventor/errors/SoError.h>
 #include <Inventor/errors/SoReadError.h>
 #include <Inventor/events/SoEvent.h>
 #include <Inventor/events/SoKeyboardEvent.h>