diff --git a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
index 939dcb2b04..72d9d1f808 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
@@ -29,6 +29,8 @@
 # include <Precision.hxx>
 # include <QApplication>
 # include <QMessageBox>
+
+# include <Inventor/SbString.h>
 #endif
 
 #include <Base/Console.h>