diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatumCS.h b/src/Mod/PartDesign/Gui/ViewProviderDatumCS.h
index 0a7602c7c5..812f388687 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatumCS.h
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatumCS.h
@@ -27,6 +27,7 @@
 #include "Gui/ViewProviderGeometryObject.h"
 #include "ViewProviderDatum.h"
 
+class SoCoordinate3;
 class SoFont;
 class SoTranslation;