diff --git a/src/Mod/Fem/App/FemPostFunction.h b/src/Mod/Fem/App/FemPostFunction.h
index c019bf9a3..9eacbed1f 100644
--- a/src/Mod/Fem/App/FemPostFunction.h
+++ b/src/Mod/Fem/App/FemPostFunction.h
@@ -62,7 +62,7 @@ protected:
     vtkBoundingBox                        m_boundingBox;
 };
 
-class FemPostFunctionProvider : public App::DocumentObject {
+class AppFemExport FemPostFunctionProvider : public App::DocumentObject {
 
     PROPERTY_HEADER(Fem::FemPostFunctionProvider);